The ratio of the work done by the machine ( C )the work done

问题描述:

The ratio of the work done by the machine ( C )the work done on it is called the efficiency of the machine.
A against B with C to D for
为什么选C?
1个回答 分类:英语 2014-10-19

问题解答:

我来补答
这里to相当于比,句中也就理解为除,机器工作率除其总量就是工作效率.相当于工作总量除以单位时间工作量就是工作效率.to做此解再如:The ratio of men to women is two to one.男女比例为二比一
 
 
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