装载机的生产率是指装载机在单位时间内所完成的工作量。
参考答案：对
_____ this afternoon, you would have to come again next week.
A．The boss were not to return
B．The boss didn’t return
C．Didn’t the boss return
D．Were the boss not to return
什么是机械制图？重要作用有哪些？
