3.如图所示一木块在垂直于倾斜天花板平面方�上的推力f作用下处于静止状态下列判断正确的是 A.天花板与木块间的弹力一定不为零 b.天花板对 Template




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tomski3.如图所示一木块在垂直于倾斜天花板平面方�上的推力f作用下处于静止状态下列判断正确的是 a.天花板与木块间的弹力一定不为零 b.天花板对 coloring