【单选题】—I would like you to talk about the Great Wall. —I’m sorry, but _________ Jack _________ I have been there.
【单选题】在下列四组选项中 , 不合法的用户标识符是 ___________ 。
【单选题】下列关于病毒性肝炎和传播方式的配对不正确的是( )
【单选题】A: Look, I'm sorry to bother you about this, but this wall between our rooms is not very soundproof and I'm doing my revison for the final exam.B: ______
B.
Just a moment, I'll close the door.
C.
All right. How about change another room?
D.
Sorry, I'll turn the music down.
【简答题】电力系统的无功电源包括 ____________ , ___________ , ___________ , ___________ 。