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Before starting a production run， it'；s not necessary to perform a trial run.。
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
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数控技术英语
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Never attempt to machine a work-piece without first checking the operation of the machine.。
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When using a tool compensation function，you should check the direction and amount of compensation.。