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The ratio of the work done by machine______the work done on it is called the eff
The ratio of the work done by machine______the work done on it is called the eff
游客
2025-04-03
7
管理
问题
The ratio of the work done by machine______the work done on it is called the efficiency of the machine.
选项
A、against
B、to
C、for
D、with
答案
B
解析
ratio表示两者之间的“比率或比例”,常与to搭配。根据句意,本题选B。
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