测得工作在放大电路中晶体管三个电极的电位分别为：请判断它们是NPN型还是PNP型？是硅管还是锗管并确定 通过三个电极的电位，怎样判断是PNP还是NPN？怎样确定三个...
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- 为硅PNP型三极管。U1为集电极c，U2为基极b，U3为发射极e。
- 为锗NPN型三极管。U1为基极b，U2为发射极e，U3为集电极c。
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