单项选择题
A.DC1000V B.DC1050V C.DC1100V D.DC1200V
A.IP51 B.IP52 C.IP53 D.IP54
A.110KVA B.220KVA C.330KVA D.440KVA
A.DC1500V B.AC380V C.DC750V D.AC110V
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