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【单选题】
---- I’d like to make an appointment with Doctor Smith . Would 9 o’clock tomorrow be all right ? ---- . Her schedule is full in the morning .A.
Yes , she’s free then
B.
I’m afraid not
C.
You must be kidding
D.
Well , it depends
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【单选题】— Look, that's Tom-the lost boy! — It's really great comfort to see him safe again. He is sure to bring comfort to his worried mother. [ ]
A.
a; a
B.
the; the
C.
a; /
D.
the; /
【单选题】听力原文：Interviewer: Well, today on Starting Out, we look at the sandwich industry in Britain. I have with me Brian Fraser, the owner of 'Designer Sandwiches', and Geraldine Holmes, another successful sa...
A.
His first shop was unpopular.
B.
He had to close one of the shops.
C.
His second shop didn't open on time.
【简答题】说明信号和变量的功能特点,以及应用上的异同点。
【简答题】能量信号的特点________
【简答题】信号按信号的能量特点进行分类：
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