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1 假設流入NPN型電晶體各極的電流為正值,且已知基極電流是0.2mA,集極電流是1.8mA,則射極電流值為
A 1.6mA
B 2mA
C -1.6mA
D -2mA
IE=0.2m+1.8m=2mA,流出電流以負值-2mA表示