問題詳情
21.如(圖七)在水平桌面上由左至右放置了甲、乙、丙、丁四個完全相同的木塊,今對四個木塊施以不同的水平力,木塊均静止不動,如圖所示。下列哪一個木塊所受的摩擦力最大?
(A)甲
(B)乙
(C)丙
(D)丁
參考答案
無參考答案
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