16.如图所示在水平力f作用下ab保持静止若a与b 的接触面是水平的且f≠0则关于b的受力个数可能为 A.3个 b.4个 C.5个 Template




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tomski16.如图所示在水平力f作用下ab保持静止若a与b 的接触面是水平的且f≠0则关于b的受力个数可能为 a.3个 coloring