单项选择题
A.5000V B.3000V C.2500V D.1000V
A.1% B.5% C.10% D.20%
A.50% B.75% C.80% D.85%
A.0.5MΩ B.1.0MΩ C.1.5MΩ D.2.0MΩ
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