刃磨成形车刀、铲齿铣刀或滚刀面时，必须严格控制前角的大小和原有几何参数，才能保证刀刃形状不产生畸变。
参考答案：对
只有将组合框的Style属性设置为何值时，才能触发DblClick事件
A．Thread
B．Runnable
C．Object
D．ThreadGroup
— Guess what! I have got A for my term paper.
— Great! You _____ read widely and put a lot of work into it. [ ]
A. must
B. should
C. must have
D. should have
