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【简答题】
设系统由下面差分方程描述： y(n)=(1/2)y (n-1)+x(n)+(1/2)x (n-1) 设系统是因果的，利用递推法求系统的单位脉冲响应。
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反馈参考答案：
举一反三
【多选题】根据个人所得税法的相关规定，下列属于划分居民纳税人和非居民纳税人标准的有（）
A.
住所标准
B.
户籍所在地标准
C.
在中国境内居住时间标准
D.
工作地点所在地标准
【单选题】There's no doubt that modern people have less and less personal space thanks ______ beepers,cell phones and e-mail.
A.
to
B.
into
C.
off
D.
of
【单选题】Thanks to the modern technology, we can get several times ________ information _______ people did in the past.
A.
as more; as
B.
as much; than
C.
as much; as
D.
as many; as
【简答题】Thanks to the means of modern transportation and communication, the world is getting smaller and smaller. The whole world community appears to be no more than a large global village, where the residen...
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