切削加工过程中，工件上同时存在三种表面，它们分别是______、______和已加工表面。
参考答案：待加工表面 过渡表面
Don't worry! They will look after her ______.[ ]
A. very good
B. very much
C. so good
D. very well
If no one ________ the lost bag，the person who found it can give it to the Lost and
Found Department.[ ]
A．claims
B．demands
C．requires
D．deserves
