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【单选题】
电路如图 所示。其中限流电阻 R=2k W , 硅稳压管 D Z1 、 D Z2 的稳定电压 U Z1 、 U Z2 分别为 6V 和 8V ,正向压降为 0.7V ,动态电阻可以忽略。试求电路输出端 A,B 两端之间电压 U AB 的值。A.
14V
B.
6.7V
C.
8.7V
D.
0V
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