16.如图9所示装置物体b所受重力物体a沿水平桌面�右匀速运动小文用一个水平�左的力拉物体a使物体b以速度匀速上升此时�轮组的机械 Template




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tomski16.如图9所示装置物体b所受重力物体a沿水平桌面�右匀速运动小文用一个水平�左的力拉物体a使物体b以速度匀速上升此时�轮组的机械 coloring