6﹑7级精度的淬火齿轮的齿形加工有哪两种方案?
参考答案:
A.滚齿(或插齿)-齿端加工-剃齿-高频淬火-修正基准-珩齿
B.滚齿(或插齿)-齿端加工-渗碳淬火-修正基准-磨齿
I had __________ to do last night.[ ]
A. a lot of works
B. some works
C. many works
D. a lot of work
浸没式光刻机相对于传统的光刻机有何不同。