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【单选题】
在反相求和式减法运算电路中,由于两个构成的电路均存在虚地,电路中没有( )信号,故允许输入的共模电压范围较大。A.
共模
B.
差模
C.
电压
D.
电流
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【单选题】Section D 听力原文： Listen to a talk given by an astronaut. Thank you. It's great to see so many of you interested in this series on 'Survival in Outer Space'. Please excuse the cameras--we're being video...
A.
To show a videotape on survival in outer space.
B.
To gain support for the space program.
C.
To describe her experience on space missions.
D.
To inform. the audience about the space suit.
【单选题】How are you?----______________
A.
How are you ?
B.
Thank you
C.
Fine, thank you.
D.
Good.
【简答题】Section D 听力原文： Thank you all very much for coming. I will try to be as brief as possible. As I expect you’ve got your rights on the refreshments set at the back of the room which will be served the m...
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