正确答案：电火花加工

第四章单元测试

1、Part programmers must have a solid knowledge of machining processes and know a lot of the capabilities of the machine tool.。

A.正确

B.错误

正确答案：正确

2、NC part programming includes three tasks：the collection of all data needed， the calculation of the tool path and the arrangement of those given and calculated data.。

A.正确

B.错误

正确答案：正确

3、The required data contained in each line of the manuscript includes all machining instructions for transferring the cutting tool from one point to the next one.。

A.正确

B.错误

正确答案：错误

4、Programmers should（）the particular NC machine， its capabilities， and specific codes.

A.calculate

B.decide

C.prove

D.be familiar

正确答案：be familiar

5、The core of（）， however， is preparation of the manuscript， its conversion into a verified tape， and subsequent editing.

A.milling machine

B.manual programming

C.drilling machine

D.computer-aided programming

正确答案：manual programming

第五章单元测试

1、Never attempt to machine a work-piece without first checking the operation of the machine.。

A.正确

B.错误

正确答案：正确

2、Before starting a production run， it'；s not necessary to perform a trial run.。

A.正确

B.错误

正确答案：错误

3、When using a tool compensation function，you should check the direction and amount of compensation.。

A.正确

B.错误

正确答案：正确

4、Incorrect operation may lead to（）.

A.serious machine troubles

B.injuries

C.work-piece

D.all right

正确答案：all right

5、Before operation the machine， you should read the contents in the（）.

A.warning labels

B.textbook

C.cell phone

D.computer

正确答案：warning labels

第六章单元测试

1、CNC diagnostic support at present includes four basic categories：start-up diagnostics，

on-line diagnostics， off-line diagnostics and background diagnostics.；。

A.正确

B.错误

正确答案：错误

2、Start-Up Diagnostics are a diagnostic routine that regularly operate automatically when the CNC is switched on.。

A.正确

B.错误

正确答案：正确

3、Off-Line Diagnostics are manual diagnostics which are intended for thorough；

maintenance performed by trained technicians.。

A.正确

B.错误

正确答案：正确