如图所示用拉力f使物体竖直匀速上升下列说法正确的是 A.拉力对物体做的功是额外功b.拉力f做的功是有用功c.拉力f移动的距离是物体移动 Template




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tomski如图所示用拉力f使物体竖直匀速上升下列说法正确的是 a.拉力对物体做的功是额外功b.拉力f做的功是有用功c.拉力f移动的距离是物体移动 coloring