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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.
The ratio of the work done by the machine ______the work done on it is called the efficiency of the machine.
admin
2009-01-05
70
问题
The ratio of the work done by the machine ______the work done on it is called the efficiency of the machine.
选项
A、against
B、with
C、to
D、for
答案
C
解析
ratio表示两者之间的“比率或比例”时,常与to搭配。其他三个介词不能与之构成搭配。
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0
专业英语四级
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