A.500MΩ B.1000MΩ C.1500MΩ D.2000MΩ
A.小于等于0.02;小于等于0.005 B.小于等于0.05;小于等于0.005 C.小于等于0.02;小于等于0.002 D.小于等于0.05;小于等于0.002
A.30% B.40% C.35% D.20%