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【单选题】
当输入信号频率等于放大电路的截止频率f L或f H时，放大倍数比中频时下降_______。A.
-3dB
B.
3dB
C.
0.7dB
D.
7dB
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皮皮学刷刷变学霸
举一反三
【单选题】According to the text, what measures should luxury industry take to deal with current dissatisfying status?
A.
Lower the price.
B.
Introduce different product lines at different price ranges for different customers.
C.
Cut cost in order to maintain the profitability.
D.
Implement a temporary policy of layoff of the staff.
【单选题】Certain measures should be taken to control environmental（）
A.
pollution
B.
pollutant
C.
pollute
D.
polluting
【单选题】Many experts feel______.
A.
carbon-dioxide emissions should be limited
B.
measures should be taken to prevent carbon-dioxide emissions
C.
carbon-intensive energy technologies should be developed
D.
there is no need to hurry [o do something about carbon-dioxide emissions
【简答题】一个完整的人工神经网络包括()。
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