A.2 B.20 C.100 D.200
A.1.73微安,2.11毫伏 B.1.74微安,2.09毫伏 C.1.75微安,2.10毫伏 D.1.76微安,2.11毫伏
A.1.1 B.1.2 C.1.3 D.1.4