• 2021-04-14
    下图所示电路中,稳压管的稳定电压Uz = 12V,电压表流过的电流忽略不计,当开关S闭合时,电压表V的读数为()。http://edu-image.nosdn.127.net/8330E3CAEA00FC41A04EC024FB9EE953.png?imageView&thumbnail=890x0&quality=100