問題詳情
23.如圖所示之起重輪系，手柄半徑R = 160mm，捲筒直徑D = 160mm，W = 960N，不計摩擦損失，則施力F應為
(A)10 N
(B)20 N
(C)30 N
(D)50 N。
參考答案
無參考答案
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