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【简答题】
设系统分别用下面的差分方程描述，x(n)与y(n)分别表示系统的输入和输出，判断系统是否是线性系统，是否是时不变系统。 (1)y(n)=x(n)+2x(n-1)+3x(n-2) (2)y(n)=3x(n)+5 (3)y(n)=x(n-n 0 )，n 0 为整常数 (4)y(n)=x(-n) (5)y(n)=x 2 (n) (6)y(n)=x(n 2 ) (7) (8)y(n)=x(n)sin(ωn)
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举一反三
【简答题】You are listening to Wave FM, your favorite radio station. Today is Tuesday. Here is the weather forecast for the rest of the week: Wednesday, Thursday and Friday will continue to be(1) and (2) . Ho...
【单选题】Because of the bad weather, the meeting will have to be _____ this afternoon.
A.
put away
B.
put on
C.
put up
D.
put off
【简答题】B的酸性比A强,为什么?排出C、D和E的碱性强弱次序。[华东理工大学2004研]
【简答题】1 Tomorrow _______ be dry. 2 _______ will be a lot of rain tomorrow evening. 3 We will have some strong _______ tonight. 4 The _______ will be bad this weekend. 5 Today is sunny with a high of 25°C an...
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A.
脑出血
B.
脑血栓
C.
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D.
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【单选题】It's going to open the _______, and inevitably there are going to be a lot of bad smells that the consensus will be that "this stinks."
A.
floodgates
B.
scents
C.
bad smells
【简答题】The will be bad this weekend.
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