The ratio of the work done by the machine ______the work done on it is called th

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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

解析句意：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。该题考查的是固定搭配。题中ratio与介词to是固定搭配，the ratio of A to B 的意思为“A与B之比(率)”。

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