問題詳情
19. 一個水平桌面上的木塊，受大小相同，方向不同的作用力而仍靜止不動，何者所受的摩擦力最小？ 
參考答案
答案：C
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)
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