單項選擇題集流環(huán)環(huán)間絕緣電阻值應(yīng)大于(),轉(zhuǎn)動時接觸電阻應(yīng)小于()

A.200MΩ,0.5Ω
B.200MΩ,5Ω
C.500MΩ,0.5Ω
D.500MΩ,5Ω


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