【单选题】---Why weren’t you at the meeting? ---I ____ an important visitor from the UK in my office.
【判断题】无论是哪种三极管,当处于放大工作状态时,基极电位总是高于发射极电位,集电极电位也总是高于基极电位。
【单选题】A: Tom, why didn't you come to the class yesterday? B: ______
A.
I had crone, but there was a visitor at home.
B.
I was going to, but I had an unexpected visitor.
C.
No way, as a visitor was coming to visit me.
D.
I'm sorry. I won't miss the class again.
【单选题】—Why weren't you at the meeting? —I ( )an important visitor from the UK in my office.
【单选题】---Alice, why didn’t you come the other day ? . ---I______, but I had an unexpected visitor.
【单选题】-Why didn't you come to the concert last night? -I_________,but I had an unexpected visitor. [ ]
【判断题】无论是哪种三极管,当处于放大工作状态时,基极电位总是高于发射极电位,集电极极电位也总是高于基极电位。