【单选题】加工齿轮、丝杠时,试指出下列各种情况哪些不属于加工原理误差?
【多选题】加工齿轮、丝杠时,试指出下列各情况哪些属于加工原理误差( )。
【单选题】听力原文:M: How do you keep in touch with old friends? W: I find email faster than the post and cheaper than phoning. I think I'd lose touch with people without it. Q: Why does the woman use email for kee...
B.
It offers the best combination of speed and low cost.
C.
She believes that, in the modern world, it is essential.
D.
She thinks that people who do not have email will lose touch with their old friends.
【判断题】路基的形式分为六种,其中以路堤和路堑两种为基本形式
【多选题】加工齿轮、丝杠时,试指出下列各种情况哪些属于加工原理误差?
【单选题】— Do you know how I can ________ him? — On his mobile phone.
【单选题】加工齿轮、丝杠时,试指出下列各情况哪些属于加工原理误差( )。