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1.有一台起重機,吊起750Kg的貨物升高0.1m需要出力20Kg,且需要將纜繩下拉5公尺,則這台起重機的機械效率為 (A)80% (B)75% (C)70% (D) 65%。
問題詳情
1.有一台起重機,吊起750Kg的貨物升高0.1m需要出力20Kg,且需要將纜繩下拉5公尺,則這台起重機的機械效率為
(A)80%
(B)75%
(C)70%
(D) 65%。
參考答案
答案:B
難度:適中0.5
統計:A(0),B(1),C(0),D(0),E(0)
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