数控机床指令代码主要有哪些
参考答案:准备功能G指令、进给功能F指令、主轴速度S指令、刀具功能T指令、辅助功能M指令。
My parents have promised to come to see me before I _______ for Africa.
A.have left
B.leave
C.left
D.will leave
He found it no pleasure ____ himself of the habit of playing computer games day and night.
A.ridding
B.getting rid
C.changing
D.defending