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During the early years of hardwired NC， built-in diagnostic tools existeD.。
During the early years of hardwired NC， built-in diagnostic tools existeD.。
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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Not only most of major machine tool manufacturers but also the CNC suppliers offer a wide variety of end-user training on CNC machines.。
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The emphasis has changed from "；how to fix it"； to "；how it works"；.。