单项选择题
A.逻辑B.接口C.220VD.110V
A.INVERTER OFFB.INVERTER ONC.FAULT CLEARD.SILENCE ON/OFF
A.N+1B.1+1C.备用D.2x2取2
A.437(+15%)B.456(+20%)C.418(+10%)D.399(+5%)
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