The ratio of the work done by the machine ______ the work done on it is called t

游客2023-11-21 58

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，如：The ratio of 10 to 5 is 2 to 1．10与5的比例是2比1。其他三个介词不能与之构成搭配。

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