The ratio of the work done by the machine______________the work done on it is called the efficiency of the machine.
- Aagainst
- Bwith
- Cto
- Dfor
问题
The ratio of the work done by the mac
参考解析：
【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。
分类：英语三级,外语考试
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