【简答题】三、在图示电路中, 已知 V CC = 12V ,晶体管的 b = 100 , R’ b = 100k Ω 。填空:要求先填文字表达式后填得数。 ( 1 )当 Ui = 0V 时,测得 U BEQ = 0.7V ,若要基极电流 I BQ = 20 μ A , 则 R’ b 和 R W 之和 R b = ≈ k Ω ;而若测得 U CEQ = 6V ,则 R c = ≈ k Ω 。
【简答题】Cathy is taking notes of the grammatical rules in class at Sunshine School, where she __________ English for a year. A.studies B.studied C.is studying D.has been studying