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id="7pxj11t" class="op-item-nut">B . </span><span id="nxx5n9f" class="op-item-meat">若僅是河水流速v<sub><span>0</span></sub>增大，則兩船的渡河時間都不變</span></span> <span id="fhpbd7h" class="op-item"><span id="d7hffdl" class="op-item-nut">C . </span><span id="b5rtjnt" class="op-item-meat">不論河水流速v<sub><span>0</span></sub>如何改變，只要適當改變θ，甲船總能到達正對岸的A點</span></span> <span id="vlv5pnd" class="op-item"><span id="3tx9r9p" class="op-item-nut">D . </span><span id="lx1jjfp" class="op-item-meat">若僅是河水流速v<sub><span>0</span></sub>增大，則兩船到達對岸時，兩船之間的距離大于l</span></span> </div> </div> </div> </li> </ul> <div style="height:20px;background-color: #fff;margin-top:1px"></div>  <div class="b5ljxnd" id="J_ConnectQuestionsdBox"> </div> </div> </div> <div id="pthdzxv" class="g-sd2">  <div style="background:#fff;padding:20px 0;margin-bottom:20px;text-align:center;"> <img src="/question/paper-qrcode?id=55668619" 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="93b7fdb" 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