The ratio of the work done by the machine ______ the work done on it is called efficiency of the machine.
A: against
B: to
C: with
D: for
A: against
B: to
C: with
D: for
举一反三
- The ratio of the work done by the machine _________ the work done on it is called the efficiency of the machine.
- The ratio of the work ______ by the machine to the work _____ on it is called the efficiency of the machine. A: to do ...to do B: doing....doing C: having done ... having done D: done ...done
- I ___________________ (印象深刻) the efficiency of the work done in the company.
- Will you show me how ( ) A: this work is done B: is this work done
- With the work _________________, they went out to play. A: doing B: be done C: done D: being done