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

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

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解答

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.”