单项选择题
A.0.25Ω B.0.5Ω C.0.25MΩ D.0.5MΩ
A.50% B.40% C.10% D.7%
A.2倍 B.相同 C.1/4 D.1/2
A.100% B.110% C.115% D.120%
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