单选题：The ratio of the work done by the machine __________ the wor

题目分类：英语三级A级
题目类型：单选题
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题目内容：

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

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答案解析：

根据以下材料回答：答案：__________

根据以下材料回答：答案：__________

分类：英语三级A级题型：单选题

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