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【简答题】
如图所示,由理想运算放大器组成的电路,已知 Ucc =12V , R1=10k Ω , R2=R4=R5=15K Ω ,R6=R7=5.1K Ω ,Ui2=-2V , Uo =-7V ,则 放大器 A1 的输出电压 Uo1 =____V, 稳压管 VZ 的稳压值 UZ=_____V.
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【简答题】This is all__________I know about the accident. 2.He is the only man __________ I can find for the work. 3.You must watch everything carefully __________ the teacher does in class. 4.Is the house ____...
【单选题】听力原文：W: Do you have a seat for the concert tomorrow? M: No seat at all, but we sell standing-room tickets two hours before the performance. Q: What does the man mean? (13)
A.
It is too late for the man to go to the concert.
B.
The man must wait for two hours to buy a ticket.
C.
People have already been standing in line for two hours.
D.
The man can buy a standing-room ticket tomorrow.
【单选题】下列各项中,年终结账时,要在总账摘要栏内注明“本年累计”字样,结出全年发生额和年末余额,并在合计数处进行的操作是()。
A.
上方通栏划单红线
B.
下方通栏划单红线
C.
上方通栏划双红线
D.
下方通栏划双红线
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