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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.
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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
时间：2022-01-03 03:12
关键词：
英语三级
外语考试
答案解析
C
【答案】C【译文】机器所做的工作与在机器上所用的功之比，就称为机器的效率。 【考点】固定搭配 【解析】题中rati0与介词t0是固定搭配，the ratio of A to B的意思为“A与B之比(率)”，故选c。
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