电路下图 所示 , U S1 =12V , U S2 = 4V , U S3 = 3V , R 1 =30 Ω, R 2 =20 Ω, R 3 = 20 Ω, 试求电路中 A 、 B 、 C 、 D 点的电位。
A.
A点电位为-4.2V;B点电位为-0.2V;
B.
D点电位为3V;C点电位为12V;
C.
A点电位为3.2V;B点电位为-0.4V;
D.
D点电位为0;C点电位为3V;
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