問題詳情
42.施力為5.5kgw，此時接觸面的摩擦力應該是多少？
(A)1.5
(B) 3.0
(C) 4.0
(D) 5.5 kgw。
(A)1.5
(B) 3.0
(C) 4.0
(D) 5.5 kgw。
參考答案
答案：B
難度：計算中-1
書單：沒有書單，新增
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