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【单选题】
在晶体管放大电路中，测得一个晶体管的各个电极的电位如图所示。则该晶体管是（  ）
A.
NPN型硅管，①——e，②——b，③——c
B.
PNP型硅管，①——c，②——b，③——e
C.
PNP型锗管，①——c，②——e，③——b
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