1、As NC machines need a large capital investment, we should efficiently use them.
A、对
B、错
2、Machining is the manufacturing in which the workers can remove the excess material of a part on a machine tool.
A、对
B、错
3、The feed is defined as the distance the cutting tool projects below the original surface of the work-piece.
A、对
B、错
4、____is the relative lateral movement between the tool and the work-piece.
A、The depth of cut
B、The cutting speed
C、The feed
D、The spindle
5、EDM（Electrical Discharge Machining）refers to in Chinese term
A、电蚀加工
B、电射加工
C、电火花加工
D、电解加工
