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<strong>題型：</strong><span id="k1n9x1v" class="source">填空題</span> </p> <div id="vrqeoju" class="xtq"><div><h1 class="q-tigan">某型號的泡茶壺正常工作時額定電流________A；泡茶壺有80%的電能被水吸收，壺中裝滿溫度為20℃的水，在標準大氣壓下將水燒開需要電能________J，共需要________s．（計算結果保留一位數(shù)） <table border="1" bordercolor="#000000" cellpadding="2" cellspacing="0"><tbody><tr><td colspan="2" width="262"> 某型號的泡茶壺</td></tr><tr><td colspan="2"> 型號：JY---456</td></tr><tr><td> 額定電壓：220V</td><td> 頻率：50Hz</td></tr><tr><td> 額定功率：1100W</td><td> 容量：1L</td></tr></tbody></table></h1></div></div><div class="mytoggle"><a class="zhankai" href="javascript:void(0)" onclick="mytoggle(this)">閻愮懓鍤仦鏇炵磻鐎瑰本鏆ｆ０妯兼窗</a></div> <p class="bottom"> </p> <a href="http://m.dads4merica.com/czwl/shiti_id_cc24346097e8f7194f06954aa5e56b08" class="daan" target="_blank">查看答案和解析>></a> </div> <div id="yfsclkb" class="xiti"> <p class="title"> <strong>科目：</strong><span id="2wzyxh8" class="source"></span> <strong>來源：</strong><span id="5d43syz" class="source"></span> <strong>題型：</strong><span id="e8rpsxd" class="source">單選題</span> </p> <div id="8w3e6as" class="xtq"><div><h1 class="q-tigan"><img src="http://thumb.zyjl.cn/pic5/upload/201310/52845b86c60ab.png" style="vertical-align:middle;float:right;">如圖：左端是固定的電磁鐵，右端是條形磁體放在水平桌面上，當開關閉合后，條形磁體受到0.5N的作用力，卻沒有移動，這說明條形磁體</h1><br><ol class="q-xz"><li><span id="ipm22qh" class="sn">A.</span><div id="nlyc5wn" class="xx">沒有受到摩擦力</div></li><li><span id="erluwr5" class="sn">B.</span><div id="1crl6uz" class="xx">摩擦力大于了0.5N</div></li><li><span id="z54nxoo" class="sn">C.</span><div id="ld4xklg" class="xx">摩擦力等于0.5N，方向向右</div></li><li><span id="u02z7yx" class="sn">D.</span><div id="8mlz3ep" class="xx">摩擦力等于0.5N，方向向左</div></li></ol></div></div><div class="mytoggle"><a class="zhankai" href="javascript:void(0)" onclick="mytoggle(this)">閻愮懓鍤仦鏇炵磻鐎瑰本鏆ｆ０妯兼窗</a></div> <p class="bottom"> </p> <a href="http://m.dads4merica.com/czwl/shiti_id_3f5e785e73cad4e0bbc355e66da905bf" class="daan" target="_blank">查看答案和解析>></a> </div> <div id="7w54sty" class="xiti"> <p class="title"> <strong>科目：</strong><span id="runrbhh" class="source"></span> <strong>來源：</strong><span id="ovke4ds" class="source"></span> <strong>題型：</strong><span id="saz5v51" class="source">單選題</span> </p> <div id="ryiwzty" class="xtq"><div><h1 class="q-tigan">電路中能產(chǎn)生的持續(xù)電流的條件是</h1><br><ol class="q-xz"><li><span id="jljtlgh" class="sn">A.</span><div id="qxhk3z9" class="xx">電路中有用電器</div></li><li><span id="ul4o8xt" class="sn">B.</span><div id="oazpxdd" class="xx">電路中有電源</div></li><li><span id="yqpyiyn" class="sn">C.</span><div id="qhwb98z" class="xx">電路中有開關</div></li><li><span id="uvlytyt" class="sn">D.</span><div id="dwftmhr" class="xx">電路中有電源，并且電路是閉合的</div></li></ol></div></div><div class="mytoggle"><a class="zhankai" href="javascript:void(0)" onclick="mytoggle(this)">閻愮懓鍤仦鏇炵磻鐎瑰本鏆ｆ０妯兼窗</a></div> <p class="bottom"> </p> <a href="http://m.dads4merica.com/czwl/shiti_id_e21ffa15961cd98c55aa74eecf4210b9" class="daan" target="_blank">查看答案和解析>></a> </div> <div id="qewzwsh" class="xiti"> <p class="title"> <strong>科目：</strong><span id="fhcv275" class="source"></span> <strong>來源：</strong><span id="vwzjnx0" class="source"></span> <strong>題型：</strong><span id="oazxcs9" class="source">解答題</span> </p> <div id="5qe1qli" class="xtq"><div><h1 class="q-tigan">在“研究電磁鐵”的實驗中，給你的器材是：一個線圈匝數(shù)可以改變的電磁鐵、電源、開關、滑動變阻器、電流表和適量的大頭針．<br>（1）該實驗所要研究的問題是：<br>①______；<br>②______；<br>③______；<br>④______．<br>（2）在上述器材中，滑動變阻器和大頭針的作用是：______．</h1></div></div><div class="mytoggle"><a class="zhankai" href="javascript:void(0)" onclick="mytoggle(this)">閻愮懓鍤仦鏇炵磻鐎瑰本鏆ｆ０妯兼窗</a></div> <p class="bottom"> </p> <a href="http://m.dads4merica.com/czwl/shiti_id_703574395af55b51a0d33d0d255308d8" class="daan" target="_blank">查看答案和解析>></a> </div> <div id="mtcppvk" class="xiti"> <p class="title"> <strong>科目：</strong><span id="sjebvb2" class="source"></span> <strong>來源：</strong><span id="s52auuu" class="source"></span> <strong>題型：</strong><span id="hvxsgmm" class="source">解答題</span> </p> <div id="exvjyez" class="xtq"><div><h1 class="q-tigan">家購買了自動電熱水壺，使用時具有無污染，省時快捷，安全節(jié)電的特點，下表中列出了該型號電熱水壺的相關數(shù)據(jù)．[C<sub>水</sub>=4.2×10<sup>3</sup>J/（kg?°C）]<br><table border="1" bordercolor="#000000" cellpadding="2" cellspacing="0"><tbody><tr><td width="85">名稱</td><td width="109">自動電熱水壺</td></tr><tr><td>最小容量</td><td>200ml</td></tr><tr><td>最大容量</td><td>800ml</td></tr><tr><td>額定功率</td><td>1000W</td></tr><tr><td>額定電壓</td><td>220V～50Hz</td></tr></tbody></table>求：（1）這熱水壺最多裝多少kg的水．<br>（2）如將質量為0.5kg的20℃的水加熱，使其溫度升高到100℃沸騰，水吸收的熱量．<br>（3）通電3分鐘燒開這壺水，消耗的電能是多少．</h1></div></div><div class="mytoggle"><a class="zhankai" href="javascript:void(0)" onclick="mytoggle(this)">閻愮懓鍤仦鏇炵磻鐎瑰本鏆ｆ０妯兼窗</a></div> <p class="bottom"> </p> <a href="http://m.dads4merica.com/czwl/shiti_id_dc8bd46bf6a092ce8e137cbbac981678" class="daan" target="_blank">查看答案和解析>></a> </div> <div id="gdi1tt8" class="xiti"> <p class="title"> <strong>科目：</strong><span id="ta78srs" class="source"></span> <strong>來源：</strong><span id="ugkjhx6" class="source"></span> <strong>題型：</strong><span id="3kjihho" class="source">單選題</span> </p> <div id="pmpu8jn" class="xtq"><div><h1 class="q-tigan">把質量為10kg，溫度為20℃的水加熱到100℃，水吸收的熱量是[C<sub>水</sub>=4.2×10<sup>3</sup> J/（kg?℃）]</h1><br><ol class="q-xz"><li><span id="8ot0fp6" class="sn">A.</span><div id="3hvjsod" class="xx">3.36×10<sup>6</sup> J</div></li><li><span id="7icrvfv" class="sn">B.</span><div id="jk78grw" class="xx">5.04×10<sup>5</sup> J</div></li><li><span id="bdmxpl5" class="sn">C.</span><div id="hyn5ccn" class="xx">4.2×10<sup>6</sup> J</div></li><li><span id="k45aj8v" class="sn">D.</span><div id="nktigws" class="xx">8.4×10<sup>5</sup> J</div></li></ol></div></div><div class="mytoggle"><a class="zhankai" href="javascript:void(0)" onclick="mytoggle(this)">閻愮懓鍤仦鏇炵磻鐎瑰本鏆ｆ０妯兼窗</a></div> <p class="bottom"> </p> <a href="http://m.dads4merica.com/czwl/shiti_id_b9aec356cb81f2cf25d6df32321e8ece" class="daan" target="_blank">查看答案和解析>></a> </div> <div id="ob82cgl" class="xiti"> <p class="title"> <strong>科目：</strong><span id="eg6832c" class="source"></span> <strong>來源：</strong><span id="1fy6k9f" class="source"></span> <strong>題型：</strong><span id="deyhuk7" class="source">填空題</span> </p> <div id="fwg3vke" class="xtq"><div><h1 class="q-tigan">人向豎直放置的平面鏡走近的過程中，人在鏡中的像的大小________（填“不變”、“變大”或“變小”）．</h1></div></div> <p class="bottom"> </p> <a href="http://m.dads4merica.com/czwl/shiti_id_d1e0e29081c311234536edeea1f4f792" class="daan" target="_blank">查看答案和解析>></a> </div> <div id="s0m038b" class="xiti"> <p class="title"> <strong>科目：</strong><span id="7w5dmwb" class="source"></span> <strong>來源：</strong><span id="3jnbyp8" class="source"></span> <strong>題型：</strong><span id="pv04xri" class="source">解答題</span> </p> <div id="1puihid" class="xtq"><div><h1 class="q-tigan">小明利用小注射器（容積為10ml）、彈簧測力計、刻度尺等器材測量大氣壓強的值，實驗步驟如下：<img src="http://thumb.zyjl.cn/pic5/upload/201308/52845b725cbc8.png" 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