某一晶体管的P CM =100mW,I CM =20mA,U (BR)CEO =15V,试问在下列几种情况下,哪种是正常工作? (1)U CE =3V,I C =10mA。 (2)U CE =2V,I C =40mA。 (3)U CE =6V,I C =20mA。
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