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.
参考答案：
答案解析：
单选题：The ratio of the work done by the machine _________ the work
- 题目分类：英语三级A级
- 题目类型：单选题
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TRICKLE : GUSH::
TRICKLE : GUSH::