单项选择题
A.±0.5% B.±1.0% C.±1.5% D.±2.5%
A.0.003Ib B.0.004Ib C.0.005Ib D.0.006Ib
A.1kV B.2kV C.3kV D.4kV
A.1% B.3% C.5% D.2%
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