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【单选题】
首届世界5G大会消息,在全球5G标准必要专利声明中,来自我国企业的占34%,居全球首位。这说明了( ) 1我国坚持创新驱动,敢于创新、善于创新 2科技改变生活,创新引领未来 3企业是社会创新的重要力量 4我国的5G与其他科技水平都全面全面超越发达国家A.
①②③
B.
②③④
C.
①③④
D.
①②④
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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】Look before you leap! You have to ______the costs of the new system against the benefits it will bring.
A.
weigh
B.
match
C.
defend
D.
Fight
【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】能量信号的特点?
【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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