单项选择题
A.小于1% B.4% C.10% D.85% E.99%
A.0 B.2 C.3 D.4 E.5
A.1/6 B.1/5 C.1/4 D.1/3 E.1/2
A.12Ω B.8Ω C.4Ω D.6Ω E.10Ω
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