2. 职称英语
  3. The ratio of the work done by the machine______the work done on it is called the

The ratio of the work done by the machine______the work done on it is called the

游客2023-09-20  47
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 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)”，故选C。
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