如图所示在水平力f的作用下木块ab保持静止.若木块a与b的接触面是水平的且f≠0.则关于木块b的受力个数可能是 A.3个或4个b Template




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tomski如图所示在水平力f的作用下木块ab保持静止.若木块a与b的接触面是水平的且f≠0.则关于木块b的受力个数可能是 a.3个或4个b coloring