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The ratio of the work done by the machine ________ the work done on it is called the efficiency of the machine.
(A) against
(B) with
(C) to
(D) for

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難度： 困難
最佳解!
CF Lee 小四上 (2012/04/24)
The ratio.....看完整詳解
2F
2020已上~阿摩謝謝 大三上 (2019/10/18)

 The ratio of students to teachers is 35: 1. 學生和老師的比率是三十五比一。


The ratio of the work done by the machin..-阿摩線上測驗