单项选择题
A.50.2V B.55.4V C.57.6V D.59.8V
A.100%；50% B.110%；60% C.115%，80% D.130%；100%
A.±5% B.±10% C.±15% D.±20%
A.±0.1% B.±0.3% C.±0.6% D.±0.9%
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