[err:数据源标签'PE.DataSource id="cone" datasource="资料_内容页" itemId="123388" xslt="true" wu="0"'返回数据错,原因:名称中不能包含“=”字符(十六进制值 0x3D)。 行 17,位置 1081。,源码:1233885 <meta http-equiv="refresh" content="0;url=/Item/123388.aspx?wu=1" /> 1268【精品】备战2020全国中考物理真题分类全解析(150套):专题1.9 压强(原卷版和解析版)34.35MB34.35Bdocczwlzx魏强czwlzx/UploadFiles/UserPic/UserAvatars/15219_150_150.jpg <script language="JavaScript" type="text/JavaScript" src="/Common/GetHits.aspx?id=123388"></script> <script language="JavaScript" type="text/JavaScript" src="/Common/GetHits.aspx?hitstype=dayhits&id=123388"></script> <script language="JavaScript" type="text/JavaScript" src="/Common/GetHits.aspx?hitstype=weekhits&id=123388"></script> <script language="JavaScript" type="text/JavaScript" src="/Common/GetHits.aspx?hitstype=monthhits&id=123388"></script> <script language="JavaScript" type="text/JavaScript" src="/Common/GetBrowseTimes.aspx?id=123388"></script> <img src="/images/star4.jpg" /> 魏强1【精品】备战2020全国中考物理真题分类全解析(150套),压强2020年02月04日/UploadFiles/nopic.gif 一、选择题1.(2019·绥化)如图所示四个实例中,属于增大压强的是(  )            A   一、选择题1.(2019·绥化)如图所示四个实例中,属于增大压强的是(  )            A                  B              C                 DA.滑雪板面积较大                                           B.骆驼宽大的脚掌  C.铁轨下铺设枕木                                           D.破窗锤敲击端做成锥状【答案】D【解析】A、滑雪板面积较大,是在压力一定时,通过增大受力面积来减小压强的,故A不符合题意;B、骆驼宽大的脚掌,是在压力一定时,通过增大受力面积来减小压强的 【内容简介】一、选择题1.(2019·绥化)如图所示四个实例中,属于增大压强的是(  )            A                  B              C                 DA.滑雪板面积较大                                           B.骆驼宽大的脚掌  C.铁轨下铺设枕木                                           D.破窗锤敲击端做成锥状【答案】D【解析】A、滑雪板面积较大,是在压力一定时,通过增大受力面积来减小压强的,故A不符合题意;B、骆驼宽大的脚掌,是在压力一定时,通过增大受力面积来减小压强的,故B不符合题意;C、铁轨下铺设枕木,是在压力一定时,通过增大受力面积来减小压强的,故C不符合题意;D、破窗锤敲击端做成锥状,是在压力一定时,通过减小受力面积来增大压强,故D符合题意。2.(2019·北京)两个完全相同的圆柱形容器静止放在水平桌面上,其中分别装有质量相等的水和酒精,液面高度如图所示。甲容器中液体对容器底部的压强和压力分别为p1和F1,乙容器中液体对容器底部的压强和压力分别为p2和F2;甲容器对桌面的压强和压力分别为p1′和F1′,乙容器对桌面的压强和压力分别为p2′和F2′,已知水的密度大于酒精的密度,则下列判断中正确的是(  )                                        甲     乙A.p1<p2、F1<F2                                            B.p1<p2、F1=F2   C.p1'=p2′、F1′=F2′                                         D.p1′>p2′,F1′>F2′【答案】C【解析】(1)分别装有质量相等的水和酒精,液柱对容器底的压力等于液柱的重力,根据G=mg,因质量相同,故F1=F2;因两个完全相同的圆柱形容器,故液柱的受力面积S相同,根据p=,液柱对容器底的压强:p1=p2;(2)容器对水平桌面的压力等于容器和液体的重力,故两容器对桌面的压力相等,F1′=F2′,根据p=,两容器对桌面的压强相等,p1′=p2′,只有C正确。3.(2019·盐城)如图所示为长江某水坝的示意图。水坝左侧水面高,B和C两点处于同一高度,A和C两点到各自液面的距离相等,水在A、B和C三点产生的压强分别为pA、pB和pC,则(   )A.pApC      C. pA>pB=pC      D.pA=pC一、选择题1.(2019&#183;绥化)如图所示四个实例中,属于增大压强的是(  )&#160;&#160;&#160;&#160;&#160; &#160; &#160;&#160;&#160;&#160;A&#160;&#160; <p><em>所属专辑:</em> <a href='/Special_207/Index.aspx' target='_blank'> 【精品】备战2020全国中考物理真题分类全解析(150套)(44个专辑) </a> </p> 下载地址1|sj/2020/2/20202492417.rar<p style=";line-height:150%"><strong><span style="line-height: 150%;font-family: 宋体">一、选择题</span></strong></p><p style=";line-height:150%"><span style="line-height: 150%">1</span><span style="line-height: 150%;font-family: 宋体">.(</span><span style="line-height: 150%">2019</span><span style="line-height: 150%">·</span><span style="line-height: 150%;font-family: 宋体">绥化)如图所示四个实例中,属于增大压强的是(  )</span></p><p style=";line-height:150%"><span style="line-height: 150%">      <img width="164" height="90" src="http://www.czwlzx.com/UEditor/themes/default/images/spacer.gif" alt="学科网(www.zxxk.com)--教育资源门户,提供试题试卷、教案、课件、教学论文、素材等各类教学资源库下载,还有大量丰富的教学资讯!" style="background:url(http://www.czwlzx.com/UEditor/lang/zh-cn/images/localimage.png) no-repeat center center;border:1px solid #ddd" /><img width="100" height="91" src="http://www.czwlzx.com/UEditor/themes/default/images/spacer.gif" alt="学科网(www.zxxk.com)--教育资源门户,提供试题试卷、教案、课件、教学论文、素材等各类教学资源库下载,还有大量丰富的教学资讯!" style="background:url(http://www.czwlzx.com/UEditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd" />  <img width="92" height="91" src="http://www.czwlzx.com/UEditor/themes/default/images/spacer.gif" alt="学科网(www.zxxk.com)--教育资源门户,提供试题试卷、教案、课件、教学论文、素材等各类教学资源库下载,还有大量丰富的教学资讯!" style="background:url(http://www.czwlzx.com/UEditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd" />    <img width="92" height="91" src="http://www.czwlzx.com/UEditor/themes/default/images/spacer.gif" alt="学科网(www.zxxk.com)--教育资源门户,提供试题试卷、教案、课件、教学论文、素材等各类教学资源库下载,还有大量丰富的教学资讯!" 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="text-indent: 70px;line-height: 150%"><span style="line-height: 150%">A                  B              C                 D</span></p><p style=";line-height: 150%"><span style="line-height: 150%">A</span><span style="line-height: 150%;font-family: 宋体">.滑雪板面积较大</span><span style="line-height: 150%">                                           B</span><span style="line-height: 150%;font-family: 宋体">.骆驼宽大的脚掌</span><span style="line-height: 150%">  </span></p><p style=";line-height: 150%"><span style="line-height: 150%">C</span><span style="line-height: 150%;font-family: 宋体">.铁轨下铺设枕木</span><span style="line-height: 150%">                                           D</span><span style="line-height: 150%;font-family: 宋体">.破窗锤敲击端做成锥状</span></p><p style=";line-height:150%"><span style=";line-height:150%;font-family:宋体;color:red">【答案】</span><span style=";line-height:150%;color:red">D</span></p><p style=";line-height:150%"><span style=";line-height:150%;font-family:宋体;color:red">【解析】</span></p><p style=";line-height:150%"><span style=";line-height:150%;color:red">A</span><span style=";line-height:150%;font-family:宋体;color:red">、滑雪板面积较大,是在压力一定时,通过增大受力面积来减小压强的,故</span><span style=";line-height:150%;color:red">A</span><span style=";line-height:150%;font-family:宋体;color:red">不符合题意;</span></p><p style=";line-height:150%"><span style=";line-height:150%;color:red">B</span><span style=";line-height:150%;font-family:宋体;color:red">、骆驼宽大的脚掌,是在压力一定时,通过增大受力面积来减小压强的,故</span><span style=";line-height:150%;color:red">B</span><span style=";line-height:150%;font-family:宋体;color:red">不符合题意;</span></p><p style=";line-height:150%"><span style=";line-height:150%;color:red">C</span><span style=";line-height:150%;font-family:宋体;color:red">、铁轨下铺设枕木,是在压力一定时,通过增大受力面积来减小压强的,故</span><span style=";line-height:150%;color:red">C</span><span style=";line-height:150%;font-family:宋体;color:red">不符合题意;</span></p><p style=";line-height:150%"><span style=";line-height:150%;color:red">D</span><span style=";line-height:150%;font-family:宋体;color:red">、破窗锤敲击端做成锥状,是在压力一定时,通过减小受力面积来增大压强,故</span><span style=";line-height:150%;color:red">D</span><span style=";line-height:150%;font-family:宋体;color:red">符合题意。</span></p><p style=";line-height:150%"><span style="line-height: 150%">2</span><span style="line-height: 150%;font-family: 宋体">.</span><span style="line-height: 150%">(2019·</span><span style="line-height: 150%;font-family: 宋体">北京</span><span style="line-height: 150%">)</span><span style="line-height: 150%;font-family: 宋体">两个完全相同的圆柱形容器静止放在水平桌面上,其中分别装有质量相等的水和酒精,液面高度如图所示。甲容器中液体对容器底部的压强和压力分别为</span><em><span style="line-height: 150%">p</span></em><sub><span style="line-height: 150%">1</span></sub><span style="line-height: 150%;font-family: 宋体">和</span><em><span style="line-height: 150%">F</span></em><sub><span style="line-height: 150%">1</span></sub><span style="line-height: 150%;font-family: 宋体">,乙容器中液体对容器底部的压强和压力分别为</span><em><span style="line-height: 150%">p</span></em><sub><span style="line-height: 150%">2</span></sub><span style="line-height: 150%;font-family: 宋体">和</span><em><span style="line-height: 150%">F</span></em><sub><span style="line-height: 150%">2</span></sub><span style="line-height: 150%;font-family: 宋体">;甲容器对桌面的压强和压力分别为</span><em><span style="line-height: 150%">p</span></em><sub><span style="line-height: 150%">1</span></sub><span style="line-height: 150%">′</span><span style="line-height: 150%;font-family: 宋体">和</span><em><span style="line-height: 150%">F</span></em><sub><span style="line-height: 150%">1</span></sub><span style="line-height: 150%">′</span><span style="line-height: 150%;font-family: 宋体">,乙容器对桌面的压强和压力分别为</span><em><span style="line-height: 150%">p</span></em><sub><span style="line-height: 150%">2</span></sub><span style="line-height: 150%">′</span><span style="line-height: 150%;font-family: 宋体">和</span><em><span style="line-height: 150%">F</span></em><sub><span style="line-height: 150%">2</span></sub><span style="line-height: 150%">′</span><span style="line-height: 150%;font-family: 宋体">,已知水的密度大于酒精的密度,则下列判断中正确的是(  )</span></p><p style="text-align:center;line-height:150%"><span style=";line-height: 150%;color:red"><img width="130" height="76" src="http://www.czwlzx.com/UEditor/themes/default/images/spacer.gif" alt="学科网(www.zxxk.com)--教育资源门户,提供试题试卷、教案、课件、教学论文、素材等各类教学资源库下载,还有大量丰富的教学资讯!" style="background:url(http://www.czwlzx.com/UEditor/lang/zh-cn/images/localimage.png) no-repeat center center;border:1px solid #ddd" /></span></p><p style=";line-height:150%"><span style=";line-height:150%;color:red">                                  </span><span style="line-height: 150%">      </span><span style="line-height: 150%;font-family: 宋体">甲</span><span style="line-height: 150%">     </span><span style="line-height: 150%;font-family: 宋体">乙</span></p><p style=";line-height: 150%"><span style="line-height: 150%">A</span><span style="line-height: 150%;font-family: 宋体">.</span><em><span style="line-height: 150%">p</span></em><sub><span style="line-height: 150%">1</span></sub><span style="line-height: 150%;font-family: 宋体"><</span><em><span style="line-height: 150%">p</span></em><sub><span style="line-height: 150%">2</span></sub><span style="line-height: 150%;font-family: 宋体">、</span><em><span style="line-height: 150%">F</span></em><sub><span style="line-height: 150%">1</span></sub><span style="line-height: 150%;font-family: 宋体"><</span><em><span style="line-height: 150%">F</span></em><sub><span style="line-height: 150%">2</span></sub><span style="line-height: 150%">                                            B</span><span style="line-height: 150%;font-family: 宋体">.</span><em><span style="line-height: 150%">p</span></em><sub><span style="line-height: 150%">1</span></sub><span style="line-height: 150%;font-family: 宋体"><</span><em><span style="line-height: 150%">p</span></em><sub><span style="line-height: 150%">2</span></sub><span style="line-height: 150%;font-family: 宋体">、</span><em><span style="line-height: 150%">F</span></em><sub><span style="line-height: 150%">1</span></sub><span style="line-height: 150%;font-family: 宋体">=</span><em><span style="line-height: 150%">F</span></em><sub><span style="line-height: 150%">2</span></sub><span style="line-height: 150%">   </span></p><p style=";line-height: 150%"><span style="line-height: 150%">C</span><span style="line-height: 150%;font-family: 宋体">.</span><em><span style="line-height: 150%">p</span></em><sub><span style="line-height: 150%">1</span></sub><span style="line-height: 150%">'</span><span style="line-height: 150%;font-family: 宋体">=</span><em><span style="line-height: 150%">p</span></em><sub><span style="line-height: 150%">2</span></sub><span style="line-height: 150%">′</span><span style="line-height: 150%;font-family: 宋体">、</span><em><span style="line-height: 150%">F</span></em><sub><span style="line-height: 150%">1</span></sub><span style="line-height: 150%">′</span><span style="line-height: 150%;font-family: 宋体">=</span><em><span style="line-height: 150%">F</span></em><sub><span style="line-height: 150%">2</span></sub><span style="line-height: 150%">′                                         D</span><span style="line-height: 150%;font-family: 宋体">.</span><em><span style="line-height: 150%">p</span></em><sub><span style="line-height: 150%">1</span></sub><span style="line-height: 150%">′</span><span style="line-height: 150%;font-family: 宋体">></span><em><span style="line-height: 150%">p</span></em><sub><span style="line-height: 150%">2</span></sub><span style="line-height: 150%">′</span><span style="line-height: 150%;font-family: 宋体">,</span><em><span style="line-height: 150%">F</span></em><sub><span style="line-height: 150%">1</span></sub><span style="line-height: 150%">′</span><span style="line-height: 150%;font-family: 宋体">></span><em><span style="line-height: 150%">F</span></em><sub><span style="line-height: 150%">2</span></sub><span style="line-height: 150%">′</span></p><p style=";line-height:150%"><span style=";line-height:150%;font-family:宋体;color:red">【答案】</span><span style=";line-height:150%;color:red">C</span></p><p style=";line-height:150%"><span style=";line-height:150%;font-family:宋体;color:red">【解析】</span></p><p style=";line-height:150%"><span style=";line-height:150%;font-family:宋体;color:red">(</span><span style=";line-height:150%;color:red">1</span><span style=";line-height:150%;font-family:宋体;color:red">)分别装有质量相等的水和酒精,液柱对容器底的压力等于液柱的重力,根据</span><em><span style=";line-height:150%;color:red">G</span></em><span style=";line-height:150%;font-family:宋体;color:red">=</span><em><span style=";line-height:150%;color:red">mg</span></em><span style=";line-height:150%;font-family:宋体;color:red">,因质量相同,故</span><em><span style=";line-height:150%;color:red">F</span></em><sub><span style=";line-height:150%;color:red">1</span></sub><span style=";line-height:150%;font-family:宋体;color:red">=</span><em><span style=";line-height:150%;color:red">F</span></em><sub><span style=";line-height:150%;color:red">2</span></sub><span style=";line-height:150%;font-family:宋体;color:red">;因两个完全相同的圆柱形容器,故液柱的受力面积</span><em><span style=";line-height:150%;color:red">S</span></em><span style=";line-height:150%;font-family:宋体;color:red">相同,根据</span><em><span style=";line-height:150%;color:red">p</span></em><span style=";line-height:150%;font-family:宋体;color:red">=</span><span style=";line-height:150%;font-family:宋体;color:red">,液柱对容器底的压强:</span><em><span style=";line-height:150%;color:red">p</span></em><sub><span style=";line-height:150%;color:red">1</span></sub><span style=";line-height:150%;font-family:宋体;color:red">=</span><em><span style=";line-height:150%;color:red">p</span></em><sub><span style=";line-height:150%;color:red">2</span></sub><span style=";line-height:150%;font-family:宋体;color:red">;</span></p><p style=";line-height:150%"><span style=";line-height:150%;font-family:宋体;color:red">(</span><span style=";line-height:150%;color:red">2</span><span style=";line-height:150%;font-family:宋体;color:red">)容器对水平桌面的压力等于容器和液体的重力,故两容器对桌面的压力相等,</span><em><span style=";line-height:150%;color:red">F</span></em><sub><span style=";line-height:150%;color:red">1</span></sub><span style=";line-height:150%;color:red">′</span><span style=";line-height:150%;font-family:宋体;color:red">=</span><em><span style=";line-height:150%;color:red">F</span></em><sub><span style=";line-height:150%;color:red">2</span></sub><span style=";line-height:150%;color:red">′</span><span style=";line-height:150%;font-family:宋体;color:red">,根据</span><em><span style=";line-height:150%;color:red">p</span></em><span style=";line-height:150%;font-family:宋体;color:red">=</span><span style=";line-height:150%;font-family:宋体;color:red">,两容器对桌面的压强相等,</span><em><span style=";line-height:150%;color:red">p</span></em><sub><span style=";line-height:150%;color:red">1</span></sub><span style=";line-height:150%;color:red">′</span><span style=";line-height:150%;font-family:宋体;color:red">=</span><em><span style=";line-height:150%;color:red">p</span></em><sub><span style=";line-height:150%;color:red">2</span></sub><span style=";line-height:150%;color:red">′</span><span style=";line-height:150%;font-family:宋体;color:red">,只有</span><span style=";line-height:150%;color:red">C</span><span style=";line-height:150%;font-family:宋体;color:red">正确。</span></p><p style=";line-height:150%"><span style="line-height: 150%">3</span><span style="line-height: 150%;font-family: 宋体">.</span><span style="line-height: 150%">(2019·</span><span style="line-height: 150%;font-family: 宋体">盐城</span><span style="line-height: 150%">)</span><span style="line-height: 150%;font-family: 宋体">如图所示为长江某水坝的示意图。水坝左侧水面高,</span><em><span style="line-height: 150%">B</span></em><span style="line-height: 150%;font-family: 宋体">和</span><em><span style="line-height: 150%">C</span></em><span style="line-height: 150%;font-family: 宋体">两点处于同一高度,</span><em><span style="line-height: 150%">A</span></em><span style="line-height: 150%;font-family: 宋体">和</span><em><span style="line-height: 150%">C</span></em><span style="line-height: 150%;font-family: 宋体">两点到各自液面的距离相等,水在</span><em><span style="line-height: 150%">A</span></em><span style="line-height: 150%;font-family: 宋体">、</span><em><span style="line-height: 150%">B</span></em><span style="line-height: 150%;font-family: 宋体">和</span><em><span style="line-height: 150%">C</span></em><span style="line-height: 150%;font-family: 宋体">三点产生的压强分别为</span><em><span style="line-height: 150%">p</span></em><sub><span style="line-height: 150%">A</span></sub><span style="line-height: 150%;font-family: 宋体">、</span><em><span style="line-height: 150%">p</span></em><sub><span style="line-height: 150%">B</span></sub><span style="line-height: 150%;font-family: 宋体">和</span><em><span style="line-height: 150%">p</span></em><sub><span style="line-height: 150%">C</span></sub><span style="line-height: 150%;font-family: 宋体">,则(</span><span style="line-height: 150%">   </span><span style="line-height: 150%;font-family: 宋体">)</span></p><p style="text-align:center;line-height:150%"><span style="line-height: 150%"><img width="112" height="89" src="http://www.czwlzx.com/UEditor/themes/default/images/spacer.gif" alt="学科网(www.zxxk.com)--教育资源门户,提供试题试卷、教案、课件、教学论文、素材等各类教学资源库下载,还有大量丰富的教学资讯!" 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=";line-height:150%"><span style="line-height: 150%">A</span><span style="line-height: 150%;font-family: 宋体">.</span><span style="line-height: 150%"><em>p</em><sub>A</sub>&lt;<em>p</em><sub>B</sub>=<em>p</em><sub>C</sub>     B</span><span style="line-height: 150%;font-family: 宋体">.</span><span style="line-height: 150%"><em>p</em><sub>A</sub>=<em>p</em><sub>B</sub>&gt;<em>p</em><sub>C</sub>      C</span><span style="line-height: 150%;font-family: 宋体">.</span><em><span style="line-height: 150%"> p</span></em><sub><span style="line-height: 150%">A</span></sub><span style="line-height: 150%">&gt;<em>p</em><sub>B</sub>=<em>p</em><sub>C</sub>      D</span><span style="line-height: 150%;font-family: 宋体">.</span><em><span style="line-height: 150%">p<sub>A</sub></span></em><span style="line-height: 150%">=<em>p</em><sub>C</sub>&lt;<em>p</em><sub>B</sub></span></p><p style=";line-height:150%"><span style=";line-height:150%;font-family:宋体;color:red">【答案】</span><span style=";line-height:150%;color:red">D </span></p><p style=";line-height:150%"><span style=";line-height:150%;font-family:宋体;color:red">【解析】在同一种液体中,液体的压强随深度的增加而增大,在同一深度处压强相等。</span><em><span style=";line-height:150%;color:red">A</span></em><span style=";line-height:150%;font-family:宋体;color:red">和</span><em><span style=";line-height:150%;color:red">C</span></em><span style=";line-height:150%;font-family:宋体;color:red">两点到各自液面的距离相等,则</span><em><span style=";line-height:150%;color:red">A</span></em><span style=";line-height:150%;font-family:宋体;color:red">和</span><em><span style=";line-height:150%;color:red">C</span></em><span style=";line-height:150%;font-family:宋体;color:red">点的深度相等,因此压强相等,</span><em><span style=";line-height:150%;color:red">B</span></em><span style=";line-height:150%;font-family:宋体;color:red">点比</span><em><span style=";line-height:150%;color:red">A</span></em><span style=";line-height:150%;font-family:宋体;color:red">点所处深度要大,则</span><em><span style=";line-height:150%;color:red">B</span></em><span style=";line-height:150%;font-family:宋体;color:red">点液体压强最大,故选</span><span style=";line-height:150%;color:red">D</span><span style=";line-height:150%;font-family:宋体;color:red">。</span></p><p style=";line-height:150%;vertical-align: middle"><span style="font-size:15px;line-height:150%">4</span><span style="font-size:15px;line-height:150%">.</span><span style="line-height: 150%">(2019·</span><span style="line-height: 150%;font-family: 宋体">青岛</span><span style="line-height: 150%">)</span><span style="font-size:15px;line-height:150%">如图为盆景的一个自动供水装置。用一个塑料瓶装满水倒放在盆景盘中,瓶口刚刚被水浸没。当盘中的水位下降到使瓶口露出水面时,空气进入瓶中,瓶中就会有水流出,使盘中的水位升高,瓶口又被浸没,瓶中的水不再流出,这样盆景盘中的水位可以保持一定高度。使水不会全部流出而能保留在瓶中的原因是</span><span style="line-height: 150%;font-family: 宋体">(  )</span></p><p style="text-align:center;line-height:150%;vertical-align:middle"><span style="line-height: 150%"><img width="132" height="74" src="http://www.czwlzx.com/UEditor/themes/default/images/spacer.gif" alt="学科网(www.zxxk.com)--教育资源门户,提供试题试卷、教案、课件、教学论文、素材等各类教学资源库下载,还有大量丰富的教学资讯!" style="background:url(http://www.czwlzx.com/UEditor/lang/zh-cn/images/localimage.png) no-repeat center center;border:1px solid #ddd" /></span></p><p style=";line-height:150%;vertical-align: middle"><span style="font-size:15px;line-height:150%">   A</span><span style="font-size:15px;line-height:150%;font-family:宋体">.</span><span style="font-size:15px;line-height:150%">瓶口太小,水不易流出</span></p><p style=";line-height:150%;vertical-align: middle"><span style="font-size:15px;line-height:150%">   B</span><span style="font-size:15px;line-height:150%;font-family:宋体">.</span><span style="font-size:15px;line-height:150%">外界大气压强等于瓶内水的压强</span></p><p style=";line-height:150%;vertical-align: middle"><span style="font-size:15px;line-height:150%">   C</span><span style="font-size:15px;line-height:150%;font-family:宋体">.</span><span style="font-size:15px;line-height:150%">外界大气压强等于瓶内空气的压强</span></p><p style=";line-height:150%;vertical-align: middle"><span style="font-size:15px;line-height:150%">   D</span><span style="font-size:15px;line-height:150%;font-family:宋体">.</span><span style="font-size:15px;line-height:150%">外界大气压强等于瓶内空气的压强与水的压强之和</span></p><p style=";line-height:150%;vertical-align: middle"><span style=";line-height:150%;font-family: 宋体;color:red">【答案】</span><span style=";line-height:150%;color:red">D </span></p><p style=";line-height:150%"><span style=";line-height:150%;font-family:宋体;color:red">【解析】瓶口所在的水面,在瓶口内受到瓶内水和瓶内气体的压强,瓶口外受到的大气压的作用,当内外压强相等时,瓶内的水不会流出,使盆景中的水位保持一定。当盆中的水蒸发掉一部分后,瓶口外水面下降,有气泡进入瓶中,使气体压强增大,瓶中的部分水流出,当水面与瓶口相平时,内外压强再次相等,水面不再上升,故答案</span><span style=";line-height:150%;color:red">D</span><span style=";line-height:150%;font-family:宋体;color:red">正确。</span></p><p><br /></p>不限不限试题试卷免费doc <img src="/images/nopic.gif" alt="%e3%80%90%e7%b2%be%e5%93%81%e3%80%91%e5%a4%87%e6%88%982020%e5%85%a8%e5%9b%bd%e4%b8%ad%e8%80%83%e7%89%a9%e7%90%86%e7%9c%9f%e9%a2%98%e5%88%86%e7%b1%bb%e5%85%a8%e8%a7%a3%e6%9e%90%ef%bc%88150%e5%a5%97%ef%bc%89%ef%bc%9a%e4%b8%93%e9%a2%981.9+%e5%8e%8b%e5%bc%ba%ef%bc%88%e5%8e%9f%e5%8d%b7%e7%89%88%e5%92%8c%e8%a7%a3%e6%9e%90%e7%89%88%ef%bc%89" border="0" /> /UploadFiles/sj/2020/2/20202492417.rar <script type="text/javascript" src="/cuplayer4/js/swfobject.js"></script> <div class="video" id="CuPlayer"><b><img src="/cuplayer4/images/loading.gif" /> 网页视频播放器加载中,请稍后...<a href="http://www.cuplayer.com/cuplayer" 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