单项选择题
A.±0.3% B.±0.5% C.±1% D.±1.5%
A.±0.5Hz B.±1Hz C.±1.25Hz D.±1.5Hz
A.25.8Hz B.26.7Hz C.27.9Hz D.29.7Hz
A.160V B.220V C.280V D.500V
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