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a-pointer" target="_blank"> (2024九上·大豐月考) </a> 如圖所示的三種裝置中，每個鉤碼質(zhì)量均為200g，定滑輪和動滑輪的重均相同。不計繩重和繩與滑輪之間的摩擦，勻速地拉動彈簧測力計，則三種裝置中彈簧測力計的示數(shù)和機械效率（　　）<p style="text-align:left;"><img src="http://tikupic.21cnjy.com/ct20241o/28/72/28720060c6c912bb6611e888a6aae57b.png" width="316" height="171" style="max-width:100%;"></p> </h1> <div id="euc2wqa" class="exam-s"> <span id="8oeioqc" class="op-item"><span id="2kucikq" class="op-item-nut">A . </span><span id="mya2cye" class="op-item-meat">F<sub>甲</sub>=F<sub>乙</sub>=F<sub>丙</sub>；η<sub>甲</sub>=η<sub>乙</sub>＝η<sub>丙</sub></span></span> <span id="cguks2q" class="op-item"><span id="2i0isq4" class="op-item-nut">B . </span><span id="24uwqoe" class="op-item-meat">F<sub>甲</sub><F<sub>乙</sub>=F<sub>丙</sub>；η<sub>甲</sub>=η<sub>乙</sub>=η<sub>丙</sub></span></span> <span id="iwcgcic" class="op-item"><span id="iu0kwe0" class="op-item-nut">C . </span><span id="mmu6e8q" class="op-item-meat">F<sub>甲</sub><F<sub>乙</sub><F<sub>丙</sub>；η<sub>甲</sub>>η<sub>乙</sub>>η<sub>丙</sub></span></span> <span id="yygque4" class="op-item"><span id="k0e2iqc" class="op-item-nut">D . </span><span id="aoyoa0k" class="op-item-meat">F<sub>甲</sub>=F<sub>乙</sub>=F<sub>丙</sub>；η<sub>甲</sub><η<sub>乙</sub><η<sub>丙</sub></span></span> </div> </div> </div> </li> </ul> <div style="height:20px;background-color: #fff;margin-top:1px"></div>  <div class="i0eikoe" id="J_ConnectQuestionsdBox"> </div> </div> </div> <div id="su228oy" class="g-sd2">  <div style="background:#fff;padding:20px 0;margin-bottom:20px;text-align:center;"> <img src="/question/paper-qrcode?id=60511806" width="140px" height="140px" alt=""> <p style="text-align:center;margin-top: 10px">微信掃碼預覽、分享更方便</p> </div> <div id="0ouuyom" class="analyize-extend JV_question__papers"> </div>  <div id="aya20ii" class="JV_question__subject"> <ul class="subjects-recomm"> <li> <a href="/merge?id=394" target="_blank"> <img 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