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【简答题】
I am sure Mike will be able to find the hotel. She has a good of ______direction ( 方向 ).
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【简答题】两级放大电路，已知第一级AV1=－100,第二级AV2=－50,则总电压放大倍数Av= [填空(1)] 。A. AV=5000
【简答题】By the time he arrives in Beijing, we ______ here for two days. A) will have stayed B) shall stay C) have been staying D) have stayed
【单选题】It _____ we have stayed together for a couple of weeks _____ I found we had a lot in common. [ ]
A.
was until; when
B.
was until; that
C.
wasn't until; when
D.
wasn't until; that
【简答题】酸价(acid value，AV)
【单选题】By the time he arrives in Beijing, we_______________here for two days. [ ]
A.
will have stayed
B.
have been staying
C.
shall stay
D.
have stayed
【简答题】三级放大电路中AV1=AV2=AV2=20 dB，则总的电压增益为_________dB；电路将输入信号放大了_________倍。 a．60 dB b．50 dB c．106 d．3
【简答题】两级放大电路，已知第一级AV1=－100,第二级AV2=－50,则总电压放大倍数Av= [填空(1)] 。A. AV=5000
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