单项选择题
A.ACK、REQ B.NOT、EOR C.AND、OR D.TIM、CNT
A.Fail safe control system B.Fail system control C.Fail safe computer D.Fail safe control
A.programmable controller B.programmable logie controller C.pesonal computer
A.PI、SI B.IV、IS C.PS、LS D.PV、SV
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