[err:数据源标签'PE.DataSource id="cone" datasource="资料_内容页" itemId="122365" xslt="true" wu="0"'返回数据错，原因：名称不能以“ ”字符(十六进制值 0x20)开头。 行 17，位置 600。，源码：12236531266上海市宝山区2020届九年级一模物理试题（word版有答案）391.28KB391.28Bdocxczwlzx宝山区czwlzx/UploadFiles/UserPic/UserAvatars/15219_150_150.jpg <script language="JavaScript" type="text/JavaScript" src="/Common/GetHits.aspx?id=122365"></script> <script language="JavaScript" type="text/JavaScript" src="/Common/GetHits.aspx?hitstype=dayhits&id=122365"></script> <script language="JavaScript" type="text/JavaScript" src="/Common/GetHits.aspx?hitstype=weekhits&id=122365"></script> <script language="JavaScript" type="text/JavaScript" src="/Common/GetHits.aspx?hitstype=monthhits&id=122365"></script> <script language="JavaScript" type="text/JavaScript" src="/Common/GetBrowseTimes.aspx?id=122365"></script> <img src="/images/star4.jpg" /> 宝山区 0 上海市,宝山区,2020届九年级一模物理试题2020年01月15日/UploadFiles/nopic.gif 考生注意：1.本试卷物理部分含五个大题。2.答题时，考生务必按答题要求在答题纸规定的位置上作答，在草稿纸考生注意：1.本试卷物理部分含五个大题。2.答题时，考生务必按答题要求在答题纸规定的位置上作答，在草稿纸、本试卷上答                                               题一律无效。一、选择题（共16分）下列各题均只有一个正确选项，请将正确选项的代号用2B铅笔填涂在答题纸的相应位置上，更改答案时，用橡皮擦去，重新填涂。1．历史上首先用实验测出大气压值的科学家是A．牛顿。                 B．帕斯卡。             C．阿基米德。          D．托里拆利。2．下列各物理量中，可以用来鉴别物质的是A．质量。                 B．重力。          【内容简介】考生注意：1.本试卷物理部分含五个大题。2.答题时，考生务必按答题要求在答题纸规定的位置上作答，在草稿纸、本试卷上答                                               题一律无效。一、选择题（共16分）下列各题均只有一个正确选项，请将正确选项的代号用2B铅笔填涂在答题纸的相应位置上，更改答案时，用橡皮擦去，重新填涂。1．历史上首先用实验测出大气压值的科学家是A．牛顿。                 B．帕斯卡。             C．阿基米德。          D．托里拆利。2．下列各物理量中，可以用来鉴别物质的是A．质量。                 B．重力。                 C．密度。                 D．体积。3．下列现象或做法是为了增大压强的是A．医用针头针尖很细。                             B．高架公路的桥板通常是空心的。C．图钉的钉帽面积较大。                          D．大型载重卡车按有较多车轮。4．容器中的0 ℃冰块（如图1所示）遇热全部化成0 ℃水，发生变化的物理量是A．容器内物体的质量。B．容器内物体的体积。C．容器底部所受压力。D．容器底部所受压强。5．同一物体先后漂浮在甲、乙两种液体上（ρ甲< ρ乙），若受到的浮力分别为F甲、F乙，A．F甲一定小于F乙。                                 B．F甲一定等于F乙。C．F甲一定大于F乙。                                 D．F甲可能小于F乙。6．甲、乙是由同种材料制成且长度相等的两根导体，若将它们串联在同一通电的电路中，则下列关于甲、乙的横截面积S及加在甲、乙两端电压U的大小判断正确的是A．若S甲>S乙，则U甲=U乙                         B．若S甲S乙，则U甲>U乙                          D．若S甲U乙7．把同种材料制成的甲、乙两个正方体各自平放在水平地面上，甲、乙对地面的压强分别为和，若把甲叠放在乙上面，如图2所示，则乙对地面的压强为：A．p1+p2                   B．p12+p22C．               D．8．在图3所示的两电路中，电源电压相等且保持不变。闭合图3（a）中电键S1，将该图中滑动变阻器R3的滑片P从最左端移到最右端，发现电流表Al的最大示数是最小示数的3倍；再将图3（b）中滑动变阻器R3的滑片P移到最左端、将图3 （b）中滑动变阻器R3滑片P 移到最右端后，闭合电键和S2，发现电流表Al、A2的示数相同。下列关于电阻R1、R2和滑动变阻器最大阻值怂的大小关系正确的是A．R1∶R2∶R3 = 1∶2∶3                          B．R1∶R2∶R3=3∶2∶1C．R1∶R2∶R3 = 1∶2∶2                           D．R1∶R2∶R3=2∶2∶1二、填空题（共25分）请将结果填入答题纸的相应位置。考生注意：1.本试卷物理部分含五个大题。2.答题时，考生务必按答题要求在答题纸规定的位置上作答，在草稿纸、本试卷上答 &#160; &#160; &#160; &#160; &#160; &#下载地址1|sj/2020/1/202011591613.docx<p style="margin-top:0;margin-right:11px;margin-bottom: 0;margin-left:13px;line-height:110%"><strong><span style="font-size:14px;line-height:110%;font-family:宋体">考生注意：</span></strong></p><p style="margin-bottom:0;margin-bottom:0;text-indent: 28px;line-height:110%"><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">1.</span><span style="font-size:14px;line-height: 110%;font-family:宋体">本试卷物理部分含五个大题。</span></p><p style="margin-bottom:0;margin-bottom:0;text-indent: 28px;line-height:110%"><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">2.</span><span style="font-size:14px;line-height: 110%;font-family:宋体">答题时，考生务必按答题要求在答题纸规定的位置上作答，在草稿纸、本试卷上答</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">                                               <img width="1px" height="1px" src="http://www.czwlzx.com/UEditor/themes/default/images/spacer.gif" style="background:url(http://www.czwlzx.com/UEditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd" /></span><span style="font-size:14px;line-height:110%;font-family: 宋体">题一律无效。</span></p><p style="margin-bottom:0;margin-bottom:0;text-indent: 28px;line-height:110%"><strong><span style="font-size: 14px;line-height:110%;font-family:宋体">一、选择题（共</span></strong><strong><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">16</span></strong><strong><span style="font-size:14px;line-height:110%;font-family:宋体">分）</span></strong></p><p style="margin-bottom:0;margin-bottom:0;text-indent: 28px;line-height:110%"><span style="font-size:14px;line-height:110%;font-family:宋体">下列各题均只有一个正确选项，请将正确选项的代号用</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">2B</span><span style="font-size:14px;line-height: 110%;font-family:宋体">铅笔填涂在答题纸的相应位置上，更改答案时，用橡皮擦去，重新填涂。</span></p><p style="margin-bottom:0;margin-bottom:0;text-indent: 28px;line-height:110%"><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">1</span><span style="font-size:14px;line-height: 110%;font-family:宋体">．历史上首先用实验测出大气压值的科学家是</span></p><p style="margin-bottom:0;margin-bottom:0;text-indent: 28px;line-height:110%"><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">A</span><span style="font-size:14px;line-height: 110%;font-family:宋体">．牛顿。</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">                 B</span><span style="font-size:14px;line-height:110%;font-family:宋体">．帕斯卡。</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">             C</span><span style="font-size:14px;line-height:110%;font-family:宋体">．阿基米德。</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">          D</span><span style="font-size:14px;line-height:110%;font-family:宋体">．托里拆利。</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'"><img width="1px" height="1px" src="http://www.czwlzx.com/UEditor/themes/default/images/spacer.gif" style="background:url(http://www.czwlzx.com/UEditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd" /></span></p><p style="margin-bottom:0;margin-bottom:0;text-indent: 28px;line-height:110%"><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">2</span><span style="font-size:14px;line-height: 110%;font-family:宋体">．下列各物理量中，可以用来鉴别物质的是</span></p><p style="margin-bottom:0;margin-bottom:0;text-indent: 28px;line-height:110%"><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">A</span><span style="font-size:14px;line-height: 110%;font-family:宋体">．质量。</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">                 B</span><span style="font-size:14px;line-height:110%;font-family:宋体">．重力。</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">                 C</span><span style="font-size:14px;line-height:110%;font-family:宋体">．密度。</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">                 D</span><span style="font-size:14px;line-height:110%;font-family:宋体">．体积。</span></p><p style="margin-bottom:0;margin-bottom:0;text-indent: 28px;line-height:110%"><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">3</span><span style="font-size:14px;line-height: 110%;font-family:宋体">．下列现象或做法是为了增大压强的是</span></p><p style="margin-bottom:0;margin-bottom:0;text-indent: 28px;line-height:110%"><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">A</span><span style="font-size:14px;line-height: 110%;font-family:宋体">．医用针头针尖很细。</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">                             B</span><span style="font-size:14px;line-height:110%;font-family:宋体">．高架公路的桥板通常是空心的。</span></p><p style="margin-bottom:0;margin-bottom:0;text-indent: 28px;line-height:110%"><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">C</span><span style="font-size:14px;line-height: 110%;font-family:宋体">．图钉的钉帽面积较大。</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">                          D</span><span style="font-size:14px;line-height:110%;font-family:宋体">．大型载重卡车按有较多车轮。</span></p><p style="margin-bottom:0;margin-bottom:0;text-indent: 29px;line-height:110%"><img width=" 106px" height=" 75px" src="http://www.czwlzx.com/UEditor/themes/default/images/spacer.gif" style="background:url(http://www.czwlzx.com/UEditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd" /><span style="font-size:14px;line-height:110%;font-family: 'Times New Roman','serif'">4</span><span style="font-size:14px;line-height:110%;font-family:宋体">．容器中的</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">0 </span><span style="font-size:14px;line-height:110%;font-family:宋体">℃</span><span style="font-size:14px;line-height: 110%;font-family:宋体">冰块（如图</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">1</span><span style="font-size:14px;line-height: 110%;font-family:宋体">所示）遇热全部化成</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">0 </span><span style="font-size:14px;line-height: 110%;font-family:宋体">℃</span><span style="font-size: 14px;line-height:110%;font-family:宋体">水，发生变化的物理量是</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'"></span></p><p style="margin-bottom:0;margin-bottom:0;text-indent: 28px;line-height:110%"><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">A</span><span style="font-size:14px;line-height: 110%;font-family:宋体">．容器内物体的质量。</span></p><p style="margin-bottom:0;margin-bottom:0;text-indent: 28px;line-height:110%"><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">B</span><span style="font-size:14px;line-height: 110%;font-family:宋体">．容器内物体的体积。</span></p><p style="margin-bottom:0;margin-bottom:0;text-indent: 28px;line-height:110%"><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">C</span><span style="font-size:14px;line-height: 110%;font-family:宋体">．容器底部所受压力。</span></p><p style="margin-bottom:0;margin-bottom:0;text-indent: 28px;line-height:110%"><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">D</span><span style="font-size:14px;line-height: 110%;font-family:宋体">．容器底部所受压强。</span></p><p style="margin-bottom:0;margin-bottom:0;text-indent: 28px;line-height:110%"><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">5</span><span style="font-size:14px;line-height: 110%;font-family:宋体">．同一物体先后漂浮在甲、乙两种液体上（</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">ρ</span><sub><span style="font-size:14px;line-height:110%;font-family:宋体">甲</span></sub><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">&lt; ρ</span><sub><span style="font-size:14px;line-height:110%;font-family:宋体">乙</span></sub><span style="font-size:14px;line-height:110%;font-family:宋体">），若受到的浮力分别为</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">F</span><sub><span style="font-size:14px;line-height:110%;font-family: 宋体">甲</span></sub><span style="font-size: 14px;line-height:110%;font-family:宋体">、</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">F</span><sub><span style="font-size:14px;line-height:110%;font-family:宋体">乙</span></sub><span style="font-size:14px;line-height:110%;font-family:宋体">，</span></p><p style="margin-bottom:0;margin-bottom:0;text-indent: 28px;line-height:110%"><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">A</span><span style="font-size:14px;line-height: 110%;font-family:宋体">．</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">F</span><sub><span style="font-size:14px;line-height:110%;font-family:宋体">甲</span></sub><span style="font-size:14px;line-height:110%;font-family:宋体">一定小于</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">F</span><sub><span style="font-size:14px;line-height:110%;font-family: 宋体">乙</span></sub><span style="font-size: 14px;line-height:110%;font-family:宋体">。</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">                                 B</span><span style="font-size:14px;line-height:110%;font-family:宋体">．</span><span style="font-size:14px;line-height: 110%;font-family:'Times New Roman','serif'">F</span><sub><span style="font-size:14px;line-height:110%;font-family:宋体">甲</span></sub><span style="font-size:14px;line-height: 110%;font-family:宋体">一定等于</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">F</span><sub><span style="font-size:14px;line-height:110%;font-family:宋体">乙</span></sub><span style="font-size:14px;line-height:110%;font-family:宋体">。</span></p><p style="margin-bottom:0;margin-bottom:0;text-indent: 28px;line-height:110%"><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">C</span><span style="font-size:14px;line-height: 110%;font-family:宋体">．</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">F</span><sub><span style="font-size:14px;line-height:110%;font-family:宋体">甲</span></sub><span style="font-size:14px;line-height:110%;font-family:宋体">一定大于</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">F</span><sub><span style="font-size:14px;line-height:110%;font-family: 宋体">乙</span></sub><span style="font-size: 14px;line-height:110%;font-family:宋体">。</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">                                 D</span><span style="font-size:14px;line-height:110%;font-family:宋体">．</span><span style="font-size:14px;line-height: 110%;font-family:'Times New Roman','serif'">F</span><sub><span style="font-size:14px;line-height:110%;font-family:宋体">甲</span></sub><span style="font-size:14px;line-height: 110%;font-family:宋体">可能小于</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">F</span><sub><span style="font-size:14px;line-height:110%;font-family:宋体">乙</span></sub><span style="font-size:14px;line-height:110%;font-family:宋体">。</span></p><p style="margin-bottom:0;margin-bottom:0;text-indent: 28px;line-height:110%"><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">6</span><span style="font-size:14px;line-height: 110%;font-family:宋体">．甲、乙是由同种材料制成且长度相等的两根导体，若将它们串联在同一通电的电路中，则下列关于甲、乙的横截面积</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">S</span><span style="font-size:14px;line-height: 110%;font-family:宋体">及加在甲、乙两端电压</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">U</span><span style="font-size:14px;line-height: 110%;font-family:宋体">的大小判断正确的是</span></p><p style="margin-bottom:0;margin-bottom:0;text-indent: 28px;line-height:110%"><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">A</span><span style="font-size:14px;line-height: 110%;font-family:宋体">．若</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">S</span><sub><span style="font-size:14px;line-height:110%;font-family:宋体">甲</span></sub><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">&gt;S</span><sub><span style="font-size:14px;line-height:110%;font-family:宋体">乙</span></sub><span style="font-size:14px;line-height:110%;font-family:宋体">，则</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">U</span><sub><span style="font-size:14px;line-height:110%;font-family: 宋体">甲</span></sub><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">=U</span><sub><span style="font-size:14px;line-height:110%;font-family:宋体">乙</span></sub><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">                         B</span><span style="font-size:14px;line-height:110%;font-family:宋体">．若</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">S</span><sub><span style="font-size:14px;line-height:110%;font-family: 宋体">甲</span></sub><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">&lt;S</span><sub><span style="font-size:14px;line-height:110%;font-family:宋体">乙</span></sub><span style="font-size:14px;line-height:110%;font-family:宋体">，则</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">U</span><sub><span style="font-size:14px;line-height:110%;font-family: 宋体">甲</span></sub><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">=U</span><sub><span style="font-size:14px;line-height:110%;font-family:宋体">乙</span></sub></p><p style="margin-bottom:0;margin-bottom:0;text-indent: 28px;line-height:110%"><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">C</span><span style="font-size:14px;line-height: 110%;font-family:宋体">．若</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">S</span><sub><span style="font-size:14px;line-height:110%;font-family:宋体">甲</span></sub><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">&gt;S</span><sub><span style="font-size:14px;line-height:110%;font-family:宋体">乙</span></sub><span style="font-size:14px;line-height:110%;font-family:宋体">，则</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">U</span><sub><span style="font-size:14px;line-height:110%;font-family: 宋体">甲</span></sub><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">&gt;U</span><sub><span style="font-size:14px;line-height:110%;font-family:宋体">乙</span></sub><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">                          D</span><span style="font-size:14px;line-height:110%;font-family:宋体">．若</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">S</span><sub><span style="font-size:14px;line-height:110%;font-family: 宋体">甲</span></sub><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">&lt;S</span><sub><span style="font-size:14px;line-height:110%;font-family:宋体">乙</span></sub><span style="font-size:14px;line-height:110%;font-family:宋体">，则</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">U</span><sub><span style="font-size:14px;line-height:110%;font-family: 宋体">甲</span></sub><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">&gt;U</span><sub><span style="font-size:14px;line-height:110%;font-family:宋体">乙</span></sub></p><p style="margin-bottom:0;margin-bottom:0;text-indent: 29px;line-height:110%"><img width=" 86px" height=" 81px" src="http://www.czwlzx.com/UEditor/themes/default/images/spacer.gif" style="background:url(http://www.czwlzx.com/UEditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd" /><span style="font-size:14px;line-height:110%;font-family: 'Times New Roman','serif'">7</span><span style="font-size:14px;line-height:110%;font-family:宋体">．把同种材料制成的甲、乙两个正方体各自平放在水平地面上，甲、乙对地面的压强分别为和，若把甲叠放在乙上面，如图</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">2</span><span style="font-size:14px;line-height: 110%;font-family:宋体">所示，则乙对地面的压强为：</span></p><p style="margin-bottom:0;margin-bottom:0;text-indent: 28px;line-height:110%"><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">A</span><span style="font-size:14px;line-height: 110%;font-family:宋体">．</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">p<sub>1</sub>+p<sub>2</sub>                   B</span><span style="font-size:14px;line-height: 110%;font-family:宋体">．</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">p<sub>1</sub><sup>2</sup>+p<sub>2</sub><sup>2</sup></span></p><p style="margin-bottom:0;margin-bottom:0;text-indent: 28px;line-height:110%"><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">C</span><span style="font-size:14px;line-height: 110%;font-family:宋体">．</span><img width="51px" height="39px" src="http://www.czwlzx.com/UEditor/themes/default/images/spacer.gif" style="background:url(http://www.czwlzx.com/UEditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd" /><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">               D</span><span style="font-size: 14px;line-height:110%;font-family:宋体">．</span><img width="57px" height="44px" src="http://www.czwlzx.com/UEditor/themes/default/images/spacer.gif" style="background:url(http://www.czwlzx.com/UEditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd" /></p><p style="margin-bottom:0;margin-bottom:0;text-indent: 28px;line-height:110%"><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">8</span><span style="font-size:14px;line-height: 110%;font-family:宋体">．在图</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">3</span><span style="font-size:14px;line-height: 110%;font-family:宋体">所示的两电路中，电源电压相等且保持不变。闭合图</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">3</span><span style="font-size:14px;line-height: 110%;font-family:宋体">（</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">a</span><span style="font-size:14px;line-height: 110%;font-family:宋体">）中电键</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">S<sub>1</sub></span><span style="font-size:14px;line-height:110%;font-family:宋体">，将该图中滑动变阻器</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">R<sub>3</sub></span><span style="font-size:14px;line-height:110%;font-family:宋体">的滑片</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">P</span><span style="font-size:14px;line-height: 110%;font-family:宋体">从最左端移到最右端，发现电流表</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">A<sub>l</sub></span><span style="font-size:14px;line-height:110%;font-family:宋体">的最大示数是最小示数的</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">3</span><span style="font-size:14px;line-height: 110%;font-family:宋体">倍；再将图</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">3</span><span style="font-size:14px;line-height: 110%;font-family:宋体">（</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">b</span><span style="font-size:14px;line-height: 110%;font-family:宋体">）中滑动变阻器</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">R<sub>3</sub></span><span style="font-size:14px;line-height:110%;font-family:宋体">的滑片</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">P</span><span style="font-size:14px;line-height: 110%;font-family:宋体">移到最左端、将图</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">3 </span><span style="font-size:14px;line-height: 110%;font-family:宋体">（</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">b</span><span style="font-size:14px;line-height: 110%;font-family:宋体">）中滑动变阻器</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">R<sub>3</sub></span><span style="font-size:14px;line-height:110%;font-family:宋体">滑片</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">P </span><span style="font-size:14px;line-height: 110%;font-family:宋体">移到最右端后，闭合电键和</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">S<sub>2</sub></span><span style="font-size:14px;line-height:110%;font-family:宋体">，发现电流表</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">A<sub>l</sub></span><span style="font-size:14px;line-height:110%;font-family:宋体">、</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">A<sub>2</sub></span><span style="font-size:14px;line-height:110%;font-family:宋体">的示数相同。下列关于电阻</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">R<sub>1</sub></span><span style="font-size:14px;line-height:110%;font-family:宋体">、</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">R<sub>2</sub></span><span style="font-size:14px;line-height:110%;font-family:宋体">和滑动变阻器最大阻值怂的大小关系正确的是</span></p><p style="margin-bottom:0;margin-bottom:0;text-indent: 28px;line-height:110%"><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">A</span><span style="font-size:14px;line-height: 110%;font-family:宋体">．</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">R<sub>1</sub></span><span style="font-size:14px;line-height:110%;font-family:宋体">∶</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">R<sub>2</sub></span><span style="font-size:14px;line-height:110%;font-family:宋体">∶</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">R<sub>3</sub> = 1</span><span style="font-size: 14px;line-height:110%;font-family:宋体">∶</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">2</span><span style="font-size:14px;line-height: 110%;font-family:宋体">∶</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">3                          B</span><span style="font-size:14px;line-height:110%;font-family:宋体">．</span><span style="font-size:14px;line-height: 110%;font-family:'Times New Roman','serif'">R<sub>1</sub></span><span style="font-size:14px;line-height:110%;font-family:宋体">∶</span><span style="font-size:14px;line-height: 110%;font-family:'Times New Roman','serif'">R<sub>2</sub></span><span style="font-size:14px;line-height:110%;font-family:宋体">∶</span><span style="font-size:14px;line-height: 110%;font-family:'Times New Roman','serif'">R<sub>3</sub>=3</span><span style="font-size:14px;line-height:110%;font-family:宋体">∶</span><span style="font-size:14px;line-height: 110%;font-family:'Times New Roman','serif'">2</span><span style="font-size:14px;line-height:110%;font-family:宋体">∶</span><span style="font-size:14px;line-height: 110%;font-family:'Times New Roman','serif'">1</span></p><p style="margin-bottom:0;margin-bottom:0;text-indent: 28px;line-height:110%"><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">C</span><span style="font-size:14px;line-height: 110%;font-family:宋体">．</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">R<sub>1</sub></span><span style="font-size:14px;line-height:110%;font-family:宋体">∶</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">R<sub>2</sub></span><span style="font-size:14px;line-height:110%;font-family:宋体">∶</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">R<sub>3</sub> = 1</span><span style="font-size: 14px;line-height:110%;font-family:宋体">∶</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">2</span><span style="font-size:14px;line-height: 110%;font-family:宋体">∶</span><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">2                           D</span><span style="font-size:14px;line-height:110%;font-family:宋体">．</span><span style="font-size:14px;line-height: 110%;font-family:'Times New Roman','serif'">R<sub>1</sub></span><span style="font-size:14px;line-height:110%;font-family:宋体">∶</span><span style="font-size:14px;line-height: 110%;font-family:'Times New Roman','serif'">R<sub>2</sub></span><span style="font-size:14px;line-height:110%;font-family:宋体">∶</span><span style="font-size:14px;line-height: 110%;font-family:'Times New Roman','serif'">R<sub>3</sub>=2</span><span style="font-size:14px;line-height:110%;font-family:宋体">∶</span><span style="font-size:14px;line-height: 110%;font-family:'Times New Roman','serif'">2</span><span style="font-size:14px;line-height:110%;font-family:宋体">∶</span><span style="font-size:14px;line-height: 110%;font-family:'Times New Roman','serif'">1</span></p><p style="margin-bottom:0;margin-bottom:0;text-indent: 28px;line-height:110%"><strong><span style="font-size: 14px;line-height:110%;font-family:宋体">二、填空题（共</span></strong><strong><span style="font-size:14px;line-height:110%;font-family:'Times New Roman','serif'">25</span></strong><strong><span 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