如图所示,光滑水平地面上有一直角三角形斜面体B靠在竖直墙壁上

如图所示,光滑水平地面上有一直角三角形斜面体B靠在竖直墙壁上,物块A放在斜面体B上,开始AB静止,现用水平力FAAB仍静止,则此时B受力个数可能是

A.3      B.4       C.5        D.6

答案

BC

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