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如圖所示，a、b兩個質(zhì)量相同的球用線連接，a球用線掛在天花板上，b球放在光滑斜面上，系統(tǒng)保持靜止，以下圖示哪個是正確的（　?。? </h1> <div id="o4gkgks" class="exam-s"> <span id="aaek6ga" class="op-item"><span id="yoyc0ko" class="op-item-nut">A . </span><span id="qcskcko" class="op-item-meat"><img width="126" height="132" src="http://tikupic.21cnjy.com/de/09/de09eab5f9b956d457ce440fe4ccfaec.png" style="max-width:100%;"></span></span> <span id="6uicucs" class="op-item"><span id="age68ec" class="op-item-nut">B . </span><span id="was82se" class="op-item-meat"><img width="130" height="132" src="http://tikupic.21cnjy.com/c6/ca/c6ca717b1b11cd561b804fe56b8efe3e.png" style="max-width:100%;"></span></span> <span id="6aqaa0i" class="op-item"><span id="gccew8q" class="op-item-nut">C . </span><span id="ycwqscg" class="op-item-meat"><img width="128" height="133" src="http://tikupic.21cnjy.com/9c/c1/9cc1fb3520bbff720a30a4f1cba8d8ae.png" style="max-width:100%;"></span></span> <span id="y6usq8o" class="op-item"><span id="yse6yac" class="op-item-nut">D . 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