問題詳情
1086.曲柄式牛頭鉋床之曲柄長12cm，連心線24cm，若往復一次需時3秒，則切削程佔____秒
(A)
(B)
(C)0.
(D)1.5。
(A)
(B)
(C)0.
(D)1.5。
參考答案
答案：B
難度：適中0.600985
統計：A(11),B(122),C(17),D(28),E(0)
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