单项选择题
A.≮0.5MΩ B.≯4Ω C.≯0.5MΩ D.≮2Ω
A.≮40% B.≯40% C.≯50% D.≮80%
A.≮75% B.≮50% C.≯50% D.≮80%
A.3% B.5% C.8% D.10%
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