如图所示ab两物体均处于静止状态关于b物体受力情况下列说法中正确的是 A.b物体可能受三个力也可能受四个力作用b.b物体一定受到 Template




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tomski如图所示ab两物体均处于静止状态关于b物体受力情况下列说法中正确的是 a.b物体可能受三个力也可能受四个力作用b.b物体一定受到 coloring