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【单选题】
一硅稳压压电路如图所示。其中未经稳压的直流输入电压VI=18V，R=1kΩ，RL=2kΩ，硅稳压管DZ的稳定电压VZ=10V，动态电阻及未被击穿时的反向电流均可忽略。试求IZ的值。【图片】A.
8mA
B.
3mA
C.
5mA
D.
0mA
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