第五章单元测试
Never attempt to machine a work-piece without first checking the operation of the machine.
Before starting a production run, it's not necessary to perform a trial run.
When using a tool compensation function,you should check the direction and amount of compensation.
Incorrect operation may lead to ________.
Before operation the machine, you should read the contents in the _______.
A:错 B:对
答案:对
A:对 B:错
A:对 B:错
A: serious machine troubles B: work-piece C: injuries D: all right
A: warning labels B: computer C: cell phone D:textbook
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