(08年济南一中期末)皮带运输机把物体匀速送向高处时,物体受到

08年济南一中期末)皮带运输机把物体匀速送向高处时,物体受到的摩擦力的方向

       A.与物体速度同向                                 B.与物体速度反向

       C.摩擦力为零                                        D.不能判定

答案

A

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