实现工艺过程中( )所消耗的时间属于辅助时间。
A．测量和检验工件
B．休息
C．准备刀具
D．切削
参考答案：A
试简述卧式打麦机清理效果差的原因？
You should _______ when your parents aren't at home.[ ]
A. look yourself after
B. take care for yourself
C. take care yourself
D. take care of yourself
