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【判断题】
一个线性时不变离散系统是因果系统的充分必要条件是：系统函数H（Z）的极点在单位圆内。A.
正确
B.
错误
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皮皮学刷刷变学霸
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A.
DHCP Discover
B.
DHCP Offer
C.
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D.
DHCP P ACK
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【简答题】Read and complete. 再读短文,完成下面的概要。(下划线部分为教材中需要修改部分) When I was a boy, I used to go camping with my classmates and teachers every summer. Once we were camping in a place above a river. If someone wanted ...
【单选题】that we were all bored with what he was saying, he changed his topic.
A.
To see
B.
Seeing
C.
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D.
Being seen
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