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【单选题】
有一晶体管接在放大电路中,今测得它的各极对地电位分别为V 1 =-4V,V 2 =-1.2V,V 3 =-1.4V,试判别管子的三个别是( )。A.
1:e、2:b、3:c
B.
1:c、2:e、3:b
C.
1:c、2:b、3:e
D.
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