试题详情

The ratio of the work done by the machine ______ the work done on it is called the efficiency of the

Most of the practical work of the government is done by _____.

op the machine. The buttons(按钮)on the machine had different colours, and the different letters on th

op the machine. The buttons(按钮)on the machine had different colours, and the different letters on th

the operation of three aesthetic instruments; the sense of place the sense of fact and the sense of