1、Never attempt to machine a work-piece without first checking the operation of the machine.
A、对
B、错
2、Before starting a production run, it’s not necessary to perform a trial run.
A、对
B、错
3、When using a tool compensation function,you should check the direction and amount of compensation.
A、对
B、错
4、Incorrect operation may lead to ________.
A、serious machine troubles
B、injuries
C、work-piece
D、all right
5、Before operation the machine, you should read the contents in the _______.
A、warning labels
B、textbook
C、cell phone
D、computer
