A.查找原因 B.監(jiān)督運(yùn)行 C.計(jì)劃?rùn)z修 D.停用待查
A.0.5% B.1% C.2% D.3%
A.300MΩ B.500MΩ C.1000MΩ D.1500MΩ
A.2ms B.3ms C.4ms D.5ms
A.3ms B.4ms C.5ms D.6ms