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

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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?

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

The ratio of the work done by the machine ( C )the work done 问个英语问题 The ratio of the work done by the machine the work is done by most of the farm work is done by machine in China today. Most of the work ___ done by him.A has B have C is D are work done to the system和work done by the system的区别 the amount of work done by the gas system in increasing the if one pays by the amount of work done and not by the hour.d The work done by the man was difficult.The man did the work He wanted the work done by 7.00翻译下 the work is done by ___ .me 还是I 为什么单项选择_______of the work is done by hand