单项选择题
A.6/10kV B.6/35kV C.10/35kV D.0.4/35kV
A.DC220 B.DC110 C.AC110 D.AC220
A.CAN B.RS232 C.RS485 D.TCP
A.180 B.120 C.130 D.无框架电压报警装置
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