一物体放在粗糙水平面上保持静止当加一个不大的且与水平方�成θ角的推力f后仍保持静止如图则 A物体所受的合力增大 b物体受水平 Template




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tomski一物体放在粗糙水平面上保持静止当加一个不大的且与水平方�成θ角的推力f后仍保持静止如图则 a物体所受的合力增大 b物体受水平 coloring