如图9所示在50n的水平拉力f作用下 重800n的物体沿水平地面做匀速直线运动 物体与地面间�动�擦力为120n则�轮组的机械效率为 Template




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tomski如图9所示在50n的水平拉力f作用下 重800n的物体沿水平地面做匀速直线运动 物体与地面间�动�擦力为120n则�轮组的机械效率为 coloring