G90指令主要用于轴类零件的外圆、内圆和锥面的加工。
A. 对
B. 错
G94指令适用于加工圆柱端面或角度大的圆锥面。
A. 对
B. 错
2.I wonder why Jenny ________us recently.We should have heard from her by now.
A. hasn’t written
B. doesn’t write
C. won’t write
D. hadn’t written
3.—When will you come to see me,Dad?I will go to see you when you ________ the training course.
A. will have finished
B. will finish
C. are finishing
D. finish