快件装车后要查看车辆是否平稳,是否符合交通运输的规范要求。
参考答案:对
齿轮的分度圆用()绘制。
A、粗实线;
B、细实线;
C、点划线;
D、双点划线。
______ quite recently, most mothers in Britain did not take paid work outside the home.
A.Before
B.Until
C.From
D.Since