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数控机床进给系统不能采用（ ）电机驱动。
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数控机床进给系统不能采用（ ）电机驱动。
A、直流伺服
B、笼式三相交流
C、步进
D、交流伺服
时间：2021-07-17 23:29
关键词：
机械制造与自动化
高起专
数控设备与编程
2020年第二学期期末考试
答案解析
B
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（）any case or suspected case of quarantinable disease，or any case of eruptive disease or any death be discovered，the local quarantine officer must be notified immediately．
Should any case or suspected case of quarantinable disease，or any case of eruptive disease or any death be discovered，the local Quarantine Officer must be（）immediately.
已知A=40；B=30；C=100；D=50，逻辑“与”运算符为and，“或”运算符为or，“非”运算符为not。计算表达式（A>B+20）or（B+60
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翻译：With Average or With Particular Average（WA or WPA）（）
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