A.500V档,绝缘阻值大于5MΩ B.500V档,绝缘阻值大于550MΩ C.1000V档,绝缘阻值大于20MΩ D.1000V档,绝缘阻值大于550MΩ
A.500V档,绝缘阻值大于0.5MΩ B.500V档,绝缘阻值大于5MΩ C.1000V档,绝缘阻值大于0.5MΩ D.1000V档,绝缘阻值大于20MΩ
A.单体电池无压差 B.单体电池压差30mv以内 C.单体电池压差100mv以内 D.单体电池压差300mv以内