问个英语问题 The ratio of the work done by the machine问个英语问题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

问个英语问题 The ratio of the work done by the machine
问个英语问题
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

C) to
to相当于数学中的“比”
句意:一台机器完成工作的量比上该机器所做的工作叫做该机器的工作效率.”

C

C

ratio of A to B
A与B的比，是搭配

百度教育团队【海纳百川团】为您解答
以后有问题可以直接向我或【海纳百川团】提问哦～
如满意，请点击“选为满意答案”按钮，谢谢～

lhkdhvnnm