电机的转速怎么判定？
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给想学习电气的小伙伴准备的福利，内含西门子全系列电子资料包，有需要的自行领取学习吧~
https://act.jcpeixun.com/topic/20201128/ly.aspx
https://act.jcpeixun.com/topic/20201128/ly.aspx
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