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170广东省香洲区2018-2019学年九年级(上)物理期末试题及答案818.52KB818.52Bdocxczwlzx香洲区czwlzx/UploadFiles/UserPic/UserAvatars/15219_150_150.jpg
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香洲区1香洲区,2018-2019学年九年级(上)物理期末试题2019年01月23日/UploadFiles/nopic.gif
(本大题7小题,每小题3分,共21分)在每小题列出的四个选项中,只有一个
(本大题7小题,每小题3分,共21分)在每小题列出的四个选项中,只有一个是正确的,请把答题卡上对应题目所选的选项涂黑。
1. 下列关于材料的说法正确的是
A.
导体的电阻由其两端的电压和通过导体的电流共同决定
B.
用超导材料制成的保险丝可以提高家庭电路的安全性
C.
半导体材料常用于制作LED灯
D.
绝缘体在任何情况下都不导电
2. 下列关于磁现象的说法正确的是
A.
磁感线是磁场中真实存在的
【内容简介】
(本大题7小题,每小题3分,共21分)在每小题列出的四个选项中,只有一个是正确的,请把答题卡上对应题目所选的选项涂黑。
1. 下列关于材料的说法正确的是
A.
导体的电阻由其两端的电压和通过导体的电流共同决定
B.
用超导材料制成的保险丝可以提高家庭电路的安全性
C.
半导体材料常用于制作LED灯
D.
绝缘体在任何情况下都不导电
2. 下列关于磁现象的说法正确的是
A.
磁感线是磁场中真实存在的曲线
B.
磁体间的相互作用是通过磁场发生的
C.
地磁场的北极在地理的北极附近,但二者并不重合
D
.小磁针静止时南极所指的方向为该点磁场的方向
3. 物理学与人类的生活密切相关,下列说法中从物理学的角度分析正确的是
A.
“花气袭人知骤暖”说明分子运动的剧烈程度与温度有关
B.
“墙内开花墙外香”说明固体分子间存在间隙
C.
“黄沙直上白云间”说明分子在不停地运动
D.
“双龙镜破再难圆”说明分子间存在斥力
4. 下列过程中,能量转化情况相同的是
①钻木取火
②水蒸气顶开活塞
③热机压缩冲程 ④煤气炉灶烧水
A.①③ B.②③ C.②④ D.③④
5. 将小磁针置于通电螺线管左侧,如题5图所示,则闭合开关后,下列说法正确的是
A. 若电源a端为正极,则螺线管左端为N极
B.
若电源a端为负极,则螺线管左端为S 极
C.
若电源b端为正极,则小磁针静止时左端为N 极
D.
若电源b端为负极,则小磁针静止时右端为S极
题5 图
6. 小珠利用题6图探究“影响通电导体产生热量的因素”,下列说法正确的是
A.
甲装置通电一段时间后,a容器内空气吸收热量多
B.
乙装置通电一段时间后,d容器内空气吸收热量多
C.
利用乙装置探究的是当电压、通电时间一定时,通电导体产生的热量与电流的关系
D.
若将甲、乙装置同时串联在电路中,通电一段时间后,
b
容器内空气吸收热量最多
a b c d
甲 乙
题6 图
题
7-1
图 题7-2 图
7. 如题7-1图所示的电路,滑动变阻器滑片从最左端移至最右端的过程中,电压表示数U及滑动变阻器R2接入电路电阻的变化情况如题7-2图所示,已知定值电阻R1=10Ω。则下列说法正确的是
A.
电源电压为
8V
B.
滑片移动的过程中,电压表示数与电流表示数之比变大
C.
滑动变阻器
R
2
的最大阻值为10Ω
D.
通过
R
1
的电流变化范围为0.2A~0.6A
(本大题7 小题,每空1 分,共21 分)
8. 原子是由 和电子组成的。用原子结构的知识可以解释:毛皮摩擦过的橡胶棒带负电是因为橡胶棒 (选填“得到”或“失去”)电子。在干燥的秋天用塑料梳子梳头发,越梳理越蓬松,是因为摩擦使头发带电,而同种电荷相互 。
9. 小海将质量和初温相同的铁、陶瓷两种材料制成的勺子(c铁
(本大题7小题,每小题3分,共21分)在每小题列出的四个选项中,只有一个是正确的,请把答题卡上对应题目所选的选项涂黑。
<p><em>所属专辑:</em>
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全国各地2018-2019九年级上学期期末考试物理试题汇总
</a>
</p>
下载地址1|sj/2019/1/201912394745.docx<div>
<p style="margin-top:3.9pt;margin-right:16.0pt;margin-bottom:0cm;margin-left:30.6pt;margin-bottom:.0001pt;text-indent:52.55pt;line-height:110%;">
<span style="position:absolute;z-index:-4;left:0px;margin-left:57px;margin-top:6px;width:112px;height:16px;">
<img height="16" src="file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image010.gif" width="112" />
</span>(<span style="letter-spacing:-.7pt;">本大题</span>7<span style="letter-spacing:-.45pt;">小题,每小题</span>3<span style="letter-spacing:-.65pt;">分,共</span>21分<span style="letter-spacing:-.15pt;">)在每小题列出的四个选项中,只有一个是正确的,请把答题卡上对应题目所选的选项涂黑。</span></p>
<p style="margin-top:6.55pt;margin-right:0cm;margin-bottom:0cm;margin-left:25.45pt;margin-bottom:.0001pt;text-indent:-15.85pt;">1. <span style="letter-spacing:-.15pt;">下列关于材料的说法正确的是</span></p>
<p style="margin-top:6.9pt;margin-right:0cm;margin-bottom:0cm;margin-left:43.6pt;margin-bottom:.0001pt;text-indent:-18.3pt;">
<span style="letter-spacing:-.15pt;">A. </span>
<span style="letter-spacing:-.15pt;">导体的电阻由其两端的电压和通过导体的电流共同决定</span>
</p>
<p style="margin-left:43.0pt;text-indent:-17.7pt;">
<span style="letter-spacing:-.15pt;">B. </span>
<span style="letter-spacing:-.15pt;">用超导材料制成的保险丝可以提高家庭电路的安全性</span>
</p>
<p style="margin-left:43.0pt;text-indent:-17.7pt;">
<span style="letter-spacing:-.15pt;">C. </span>
<span style="letter-spacing:-.4pt;">半导体材料常用于制作</span>LED灯</p>
<p style="margin-left:43.6pt;text-indent:-18.3pt;">
<span style="letter-spacing:-.15pt;">D. </span>
<span style="letter-spacing:-.15pt;">绝缘体在任何情况下都不导电</span>
</p>
<p style="margin-top:7.1pt;margin-right:0cm;margin-bottom:0cm;margin-left:25.45pt;margin-bottom:.0001pt;text-indent:-15.85pt;">2. <span style="letter-spacing:-.15pt;">下列关于磁现象的说法正确的是</span></p>
<p style="margin-left:43.6pt;text-indent:-18.3pt;">
<span style="letter-spacing:-.15pt;">A. </span>
<span style="letter-spacing:-.15pt;">磁感线是磁场中真实存在的曲线</span>
</p>
<p style="margin-left:43.0pt;text-indent:-17.7pt;">
<span style="letter-spacing:-.15pt;">B. </span>
<span style="letter-spacing:-.15pt;">磁体间的相互作用是通过磁场发生的</span>
</p>
<p style="margin-top:6.95pt;margin-right:188.5pt;margin-bottom:0cm;margin-left:25.3pt;margin-bottom:.0001pt;line-height:151%;">
<span style="letter-spacing:-.15pt;">C. </span>
<span style="letter-spacing:-.15pt;">地磁场的北极在地理的北极附近,但二者并不重合</span>
<span style="letter-spacing:-.15pt;">D</span>
<span style="letter-spacing:-.15pt;">.小磁针静止时南极所指的方向为该点磁场的方向</span>
</p>
<p style="margin-top:0cm;margin-right:0cm;margin-bottom:0cm;margin-left:25.45pt;margin-bottom:.0001pt;text-indent:-15.85pt;">3. <span style="letter-spacing:-.15pt;">物理学与人类的生活密切相关,下列说法中从物理学的角度分析正确的是</span></p>
<p style="margin-left:43.6pt;text-indent:-18.3pt;">
<span style="letter-spacing:-.15pt;">A. </span>
<span style="letter-spacing:-.15pt;">“花气袭人知骤暖”说明分子运动的剧烈程度与温度有关</span>
</p>
<p style="margin-left:43.0pt;text-indent:-17.7pt;">
<span style="letter-spacing:-.15pt;">B. </span>
<span style="letter-spacing:-.15pt;">“墙内开花墙外香”说明固体分子间存在间隙</span>
</p>
<p style="margin-top:7.0pt;margin-right:0cm;margin-bottom:0cm;margin-left:43.0pt;margin-bottom:.0001pt;text-indent:-17.7pt;">
<span style="letter-spacing:-.15pt;">C. </span>
<span style="letter-spacing:-.15pt;">“黄沙直上白云间”说明分子在不停地运动</span>
</p>
<p style="margin-top:7.05pt;margin-right:0cm;margin-bottom:0cm;margin-left:43.6pt;margin-bottom:.0001pt;text-indent:-18.3pt;">
<span style="letter-spacing:-.15pt;">D. </span>
<span style="letter-spacing:-.15pt;">“双龙镜破再难圆”说明分子间存在斥力</span>
</p>
<p style="margin-left:25.45pt;text-indent:-15.85pt;">4. <span style="letter-spacing:-.15pt;">下列过程中,能量转化情况相同的是</span></p>
<p style="margin-top:.2pt;margin-right:0cm;margin-bottom:.05pt;margin-left:0cm;"> </p>
<p style="margin-left:40.15pt;">
<span style="position:relative;top:-1.0pt;">
<img height="91" src="file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image012.gif" width="85" />
</span> <img height="93" src="file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image014.gif" width="75" /> <img height="101" src="file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image016.gif" width="61" /> <span style="position:relative;top:-1.5pt;"><img height="76" src="file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image018.gif" width="78" /></span></p>
</div>
<p> </p>
<div>
<p style="margin-top:2.95pt;margin-right:0cm;margin-bottom:0cm;margin-left:53.75pt;margin-bottom:.0001pt;">①钻木取火</p>
<br clear="all" />
<p style="margin-top:4.15pt;margin-right:0cm;margin-bottom:0cm;margin-left:17.35pt;margin-bottom:.0001pt;">②水蒸气顶开活塞</p>
<br clear="all" />
<p style="margin-top:3.65pt;margin-right:0cm;margin-bottom:0cm;margin-left:23.3pt;margin-bottom:.0001pt;">③热机压缩冲程 <span style="position:relative;top:-.5pt;">④煤气炉灶烧水</span></p>
</div>
<p> </p>
<div>
<p style="margin-top:6.25pt;margin-right:0cm;margin-bottom:0cm;margin-left:23.75pt;margin-bottom:.0001pt;">A.①③ B.②③ C.②④ D.③④</p>
</div>
<p> </p>
<div>
<p style="margin-top:2.5pt;margin-right:0cm;margin-bottom:0cm;margin-left:30.6pt;margin-bottom:.0001pt;text-indent:-21.0pt;">5. <span style="position:absolute;z-index:3;left:0px;margin-left:497px;margin-top:22px;width:89px;height:75px;"><img height="75" src="file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image020.gif" width="89" /></span><span style="letter-spacing:-.3pt;">将小磁针置于通电螺线管左侧,如题</span>5<span style="letter-spacing:-.15pt;">图所示,则闭合开关后,下列说法正确的是</span></p>
<p style="margin-top:2.85pt;margin-right:0cm;margin-bottom:0cm;margin-left:48.9pt;margin-bottom:.0001pt;text-indent:-18.3pt;">
<span style="letter-spacing:-.15pt;">A. </span>若<span style="letter-spacing:-.15pt;">电</span>源a端<span style="letter-spacing:-.15pt;">为</span>正<span style="letter-spacing:-.15pt;">极</span>,<span style="letter-spacing:-.15pt;">则</span>螺线<span style="letter-spacing:-.15pt;">管</span>左<span style="letter-spacing:-.15pt;">端</span><span style="letter-spacing:2.55pt;">为</span>N极 <span style="position:relative;top:4.0pt;"><img height="14" src="file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image022.gif" width="25" /></span></p>
<p style="margin-top:1.45pt;margin-right:0cm;margin-bottom:0cm;margin-left:48.3pt;margin-bottom:.0001pt;text-indent:-17.7pt;">
<span style="letter-spacing:-.15pt;">B. </span>
<span style="letter-spacing:-.75pt;">若电源</span>a<span style="letter-spacing:.05pt;">端为负极,则螺线管左端为</span>S 极</p>
<p style="margin-top:2.9pt;margin-right:0cm;margin-bottom:0cm;margin-left:48.3pt;margin-bottom:.0001pt;text-indent:-17.7pt;">
<span style="letter-spacing:-.15pt;">C. </span>
<span style="letter-spacing:-.75pt;">若电源</span>b<span style="letter-spacing:-.35pt;">端为正极,则小磁针静止时左端为</span>N 极</p>
</div>
<p> </p>
<div>
<p style="margin-top:2.85pt;margin-right:0cm;margin-bottom:0cm;margin-left:48.9pt;margin-bottom:.0001pt;text-indent:-18.3pt;">
<span style="letter-spacing:-.15pt;">D. </span>
<span style="letter-spacing:-.7pt;">若电源</span>b端为负极,则小磁针静止时右端为S极</p>
<br clear="all" />
<p style="margin-top:6.4pt;margin-right:0cm;margin-bottom:0cm;margin-left:30.6pt;margin-bottom:.0001pt;">题5 图</p>
</div>
<p> </p>
<div>
<p style="margin-top:1.25pt;margin-right:0cm;margin-bottom:0cm;margin-left:30.6pt;margin-bottom:.0001pt;text-indent:-21.0pt;">6. <span style="letter-spacing:-.1pt;">小珠利用题</span>6<span style="letter-spacing:-.45pt;">图探究“影响通电导体产生热量的因素”,下列说法正确的是</span></p>
<p style="margin-top:3.0pt;margin-right:0cm;margin-bottom:0cm;margin-left:48.9pt;margin-bottom:.0001pt;text-indent:-18.3pt;">
<span style="letter-spacing:-.15pt;">A. </span>
<span style="letter-spacing:-.15pt;">甲装置通电一段时间后,</span>a<span style="letter-spacing:-.15pt;">容器内空气吸收热量多</span></p>
<p style="margin-top:2.85pt;margin-right:0cm;margin-bottom:0cm;margin-left:48.3pt;margin-bottom:.0001pt;text-indent:-17.7pt;">
<span style="letter-spacing:-.15pt;">B. </span>
<span style="letter-spacing:-.15pt;">乙装置通电一段时间后,</span>d<span style="letter-spacing:-.15pt;">容器内空气吸收热量多</span></p>
<p style="margin-top:2.85pt;margin-right:0cm;margin-bottom:0cm;margin-left:48.3pt;margin-bottom:.0001pt;text-indent:-17.7pt;">
<span style="letter-spacing:-.15pt;">C. </span>
<span style="letter-spacing:-.5pt;">利用乙装置探究的是当电压、通电时间一定时,通电导体产生的热量与电流的关系</span>
</p>
<p style="margin-top:2.9pt;margin-right:0cm;margin-bottom:0cm;margin-left:48.9pt;margin-bottom:.0001pt;text-indent:-18.3pt;">
<span style="letter-spacing:-.15pt;">D. </span>
<span style="letter-spacing:-.5pt;">若将甲、乙装置同时串联在电路中,通电一段时间后,</span>
<span style="letter-spacing:-.25pt;">b</span>
<span style="letter-spacing:-.5pt;">容器内空气吸收热量最多</span>
</p>
<p> </p>
<p> </p>
<p> </p>
<p> </p>
<p> </p>
<p style="margin-top:.05pt;"> </p>
</div>
<p> </p>
<div>
<p align="center" style="margin-top:4.9pt;margin-right:0cm;margin-bottom:0cm;margin-left:38.65pt;margin-bottom:.0001pt;text-align:center;line-height:8.8pt;">
<span style="position:relative;z-index:-1;">
<span style="left:0px;position:absolute;left:75px;top:-99px;width:255px;height:110px;">
<img height="110" src="file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image024.gif" width="255" />
</span>
</span>a <span style="position:relative;top:.5pt;">b </span>c <span style="position:relative;top:1.0pt;letter-spacing:-1.0pt;">d</span></p>
<p align="center" style="margin-left:36.3pt;text-align:center;line-height:65%;">
<span style="position:relative;top:2.5pt;">甲 </span>乙</p>
<p align="center" style="margin-left:26.8pt;text-align:center;line-height:10.4pt;">题6 图</p>
<br clear="all" />
<p> </p>
<p style="margin-top:.3pt;"> </p>
<p style="margin-left:72.8pt;">
<span style="position:relative;z-index:4;">
<span style="left:0px;position:absolute;left:355px;top:-106px;width:144px;height:105px;">
<img height="105" src="file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image026.gif" width="144" />
</span>
</span>
<span style="position:relative;z-index:-2;">
<span style="left:0px;position:absolute;left:508px;top:-108px;width:118px;height:111px;">
<img height="111" src="file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image028.gif" width="118" />
</span>
</span>
<span style="position:relative;top:-.5pt;">题</span>
<span style="position:relative;top:-.5pt;">7-1</span>
<span style="position:relative;top:-.5pt;">图 </span>题7-2 图</p>
</div>
<p> </p>
<p style="margin-top:.4pt;"> </p>
<p style="margin-top:3.95pt;margin-right:16.1pt;margin-bottom:0cm;margin-left:25.3pt;margin-bottom:.0001pt;text-align:justify;text-justify:inter-ideograph;text-indent:-15.7pt;line-height:131%;">7. <span style="letter-spacing:-.8pt;">如题</span>7-1<span style="letter-spacing:-.25pt;">图所示的电路,滑动变阻器滑片从最左端移至最右端的过程中,电压表示数</span><em>U</em><span style="letter-spacing:-.15pt;">及滑</span><span style="letter-spacing:-.35pt;">动变阻器</span><em>R</em><sub>2</sub><span style="letter-spacing:-.25pt;">接入电路电阻的变化情况如题</span>7-2<span style="letter-spacing:-.3pt;">图所示,已知定值电阻</span><em>R</em><sub>1</sub>=10Ω<span style="letter-spacing:-.1pt;">。则下列说法</span><span style="letter-spacing:-.15pt;">正确的是</span></p>
<p style="margin-top:0cm;margin-right:0cm;margin-bottom:0cm;margin-left:43.6pt;margin-bottom:.0001pt;text-indent:-18.3pt;line-height:13.25pt;">
<span style="letter-spacing:-.15pt;">A. </span>
<span style="letter-spacing:-.6pt;">电源电压为</span>
<span style="letter-spacing:-.15pt;">8V</span>
</p>
<p style="margin-top:4.3pt;margin-right:0cm;margin-bottom:0cm;margin-left:43.0pt;margin-bottom:.0001pt;text-indent:-17.7pt;">
<span style="letter-spacing:-.15pt;">B. </span>
<span style="letter-spacing:-.15pt;">滑片移动的过程中,电压表示数与电流表示数之比变大</span>
</p>
<p style="margin-top:4.2pt;margin-right:0cm;margin-bottom:0cm;margin-left:43.0pt;margin-bottom:.0001pt;text-indent:-17.7pt;">
<span style="letter-spacing:-.15pt;">C. </span>
<span style="letter-spacing:-.6pt;">滑动变阻器</span>
<em>R</em>
<sub>2</sub>
<span style="letter-spacing:-.55pt;">的最大阻值为</span>10Ω</p>
<p style="margin-top:4.3pt;margin-right:0cm;margin-bottom:0cm;margin-left:43.6pt;margin-bottom:.0001pt;text-indent:-18.3pt;">
<span style="letter-spacing:-.15pt;">D. </span>
<span style="letter-spacing:-.95pt;">通过</span>
<em>R</em>
<sub>1</sub>
<span style="letter-spacing:-.45pt;">的电流变化范围为</span>0.2A~0.6A</p>
<p style="margin-top:.45pt;"> </p>
<p style="margin-top:3.95pt;margin-right:0cm;margin-bottom:0cm;margin-left:62.15pt;margin-bottom:.0001pt;">
<span style="position:absolute;z-index:-3;left:0px;margin-left:57px;margin-top:7px;width:84px;height:16px;">
<img height="16" src="file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image030.gif" width="84" />
</span>(本大题7 小题,每空1 分,共21 分)</p>
<p style="margin-top:.1pt;"> </p>
<p style="margin-top:0cm;margin-right:16.25pt;margin-bottom:0cm;margin-left:25.3pt;margin-bottom:.0001pt;text-align:justify;text-justify:inter-ideograph;text-indent:-15.7pt;line-height:131%;">8. 原子<span style="letter-spacing:-.15pt;">是</span>由 <span style="letter-spacing:-.15pt;">和</span>电<span style="letter-spacing:-.15pt;">子</span>组成的<span style="letter-spacing:-.15pt;">。</span>用原<span style="letter-spacing:-.15pt;">子</span>结构<span style="letter-spacing:-.15pt;">的知</span>识可以<span style="letter-spacing:-.15pt;">解</span>释:<span style="letter-spacing:-.15pt;">毛</span>皮摩<span style="letter-spacing:-.15pt;">擦过</span>的橡胶<span style="letter-spacing:-.15pt;">棒</span>带负<span style="letter-spacing:-.15pt;">电</span>是因为<span style="letter-spacing:-.15pt;">橡</span>胶<span style="letter-spacing:-.15pt;">棒</span> (<span style="letter-spacing:-.15pt;">选</span><span style="letter-spacing:-.75pt;">填</span>“<span style="letter-spacing:-.15pt;">得到</span><span style="letter-spacing:-.6pt;">”</span><span style="letter-spacing:-.75pt;">或</span>“<span style="letter-spacing:-.15pt;">失</span>去<span style="letter-spacing:-5.4pt;">”</span><span style="letter-spacing:-.65pt;">)</span><span style="letter-spacing:-.15pt;">电子</span><span style="letter-spacing:-.65pt;">。</span><span style="letter-spacing:-.15pt;">在</span>干<span style="letter-spacing:-.15pt;">燥</span>的<span style="letter-spacing:-.15pt;">秋</span>天<span style="letter-spacing:-.15pt;">用</span>塑<span style="letter-spacing:-.15pt;">料梳</span>子梳<span style="letter-spacing:-.15pt;">头发</span><span style="letter-spacing:-.65pt;">,</span><span style="letter-spacing:-.15pt;">越</span>梳理越<span style="letter-spacing:-.15pt;">蓬</span>松<span style="letter-spacing:-.15pt;">,</span>是<span style="letter-spacing:-.15pt;">因</span>为<span style="letter-spacing:-.15pt;">摩</span>擦<span style="letter-spacing:-.15pt;">使</span>头发<span style="letter-spacing:-.15pt;">带</span>电<span style="letter-spacing:-.15pt;">,</span>而<span style="letter-spacing:-.15pt;">同</span>种<span style="letter-spacing:-.15pt;">电</span>荷<span style="letter-spacing:-.15pt;">相</span>互 。</p>
<p style="margin-top:7.7pt;margin-right:16.1pt;margin-bottom:0cm;margin-left:25.3pt;margin-bottom:.0001pt;text-align:justify;text-justify:inter-ideograph;text-indent:-15.7pt;line-height:130%;">9. <span style="position:relative;top:-.5pt;letter-spacing:-.15pt;">小</span><span style="position:relative;top:-.5pt;">海<span style="letter-spacing:-.15pt;">将</span>质<span style="letter-spacing:-.15pt;">量</span>和<span style="letter-spacing:-.15pt;">初</span>温<span style="letter-spacing:-.15pt;">相同</span>的铁<span style="letter-spacing:-.15pt;">、</span>陶<span style="letter-spacing:-.15pt;">瓷</span>两<span style="letter-spacing:-.15pt;">种</span>材<span style="letter-spacing:-.15pt;">料</span>制<span style="letter-spacing:-.15pt;">成</span>的勺<span style="letter-spacing:-.15pt;">子</span>(</span><em><span style="position:relative;top:-.5pt;">c</span></em><span style="letter-spacing:-.15pt;">铁</span><span style="position:relative;top:-.5pt;"><<em>c</em></span>陶<span style="letter-spacing:-.15pt;">瓷</span><span style="position:relative;top:-.5pt;">)<span style="letter-spacing:-.15pt;">浸没</span>在沸<span style="letter-spacing:-.15pt;">水</span>中<span style="letter-spacing:-.15pt;">煮</span>足<span style="letter-spacing:-.15pt;">够</span>长一段时间进行消毒,<span style="letter-spacing:.15pt;">则</span>消毒结束时两者温度关系为:</span><em><span style="position:relative;top:-.5pt;">t </span></em>铁 <em><span style="position:relative;top:-.5pt;">t</span></em>陶瓷<span style="position:relative;top:-.5pt;">(选填“>”、“</span><span style="position:relative;top:-.5pt;">=</span><span style="position:relative;top:-.5pt;">”<span style="letter-spacing:-.6pt;">或</span></span></p>
<p style="margin-top:.15pt;margin-right:0cm;margin-bottom:0cm;margin-left:25.3pt;margin-bottom:.0001pt;">“<<span style="letter-spacing:-.15pt;">”</span><span style="letter-spacing:-5.3pt;">)</span><span style="letter-spacing:-.15pt;">,</span>内<span style="letter-spacing:-.15pt;">能</span>增<span style="letter-spacing:-.15pt;">加</span>更<span style="letter-spacing:-.15pt;">多的</span>是 <span style="letter-spacing:-.15pt;">勺</span>子<span style="letter-spacing:-.15pt;">,</span>这<span style="letter-spacing:-.15pt;">是</span>通<span style="letter-spacing:-.15pt;">过</span> 方<span style="letter-spacing:-.15pt;">式</span>改<span style="letter-spacing:-.15pt;">变</span>内<span style="letter-spacing:-.15pt;">能</span>的。</p>
<p style="margin-top:.45pt;"> </p>
<p style="margin-top:0cm;margin-right:0cm;margin-bottom:0cm;margin-left:32.15pt;margin-bottom:.0001pt;text-indent:-22.55pt;">10. <span style="letter-spacing:.5pt;">某家用电能表表盘如题</span>10<span style="letter-spacing:.5pt;">图所示,则该家庭电路同时使用的用电器总功率不得超过</span></p>
<p style="margin-top:4.35pt;margin-right:10.85pt;margin-bottom:0cm;margin-left:25.3pt;margin-bottom:.0001pt;line-height:130%;"> W;若<span style="letter-spacing:-.15pt;">只</span>将<span style="letter-spacing:-.15pt;">某</span>品<span style="letter-spacing:-.15pt;">牌</span>豆浆<span style="letter-spacing:-.15pt;">机</span>接<span style="letter-spacing:-.15pt;">入</span>该<span style="letter-spacing:-.15pt;">家</span>庭<span style="letter-spacing:-.15pt;">电</span>路<span style="letter-spacing:-.15pt;">,</span>正常<span style="letter-spacing:-.15pt;">工</span>作2min,<span style="letter-spacing:-.15pt;">电</span>能<span style="letter-spacing:-.15pt;">表的</span>转盘<span style="letter-spacing:-.15pt;">转</span>过150r,则它<span style="letter-spacing:-.15pt;">的</span>实<span style="letter-spacing:-.15pt;">际</span>电<span style="letter-spacing:-.15pt;">功</span>率为 <span style="letter-spacing:-.7pt;">kW</span><span style="letter-spacing:-.7pt;">;</span>从<span style="letter-spacing:-.15pt;">安</span>全<span style="letter-spacing:-.15pt;">用</span>电<span style="letter-spacing:-.15pt;">角</span>度<span style="letter-spacing:-.15pt;">看</span><span style="letter-spacing:-2.05pt;">,</span>豆浆<span style="letter-spacing:-.15pt;">机</span>的<span style="letter-spacing:-.15pt;">金</span>属<span style="letter-spacing:-.15pt;">外</span>壳<span style="letter-spacing:-.15pt;">一</span>定<span style="letter-spacing:-.15pt;">要</span>与 <span style="letter-spacing:-.15pt;">相</span>连<span style="letter-spacing:-.85pt;">。</span></p>人教版不限试题试卷专供vip会员docx
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