单项选择题
A.10% B.11% C.12% D.13%
A.30兆欧 B.30Ω C.50Ω D.50兆欧
A.0.5 B.0.6 C.0.8 D.0.7
A.0.3 B.0.4 C.0.5 D.0.6
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