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【单选题】
测得放大电路中三极管3个电极对地点电位U 1 、U 2 、U 3 分别为5V,2.2V,1.5V,则这三个电极对应三极管的三个电极为( )。A.
b 、c、e
B.
b 、e、c
C.
c 、b、e
D.
c 、e、b
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