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关于使用幂级数展开法求解Z反变换的说法正确的是( )
A.
因为Z变换就是将序列作为幂级数的系数变成了函数，所以可以使用长除法将其Z变换进行幂级数展开，其系数对应的取值就是序列值。
B.
因果序列的Z变换展开幂级数，X(z)的分子分母都按z的降幂排列。
C.
非因果序列的Z变换展开幂级数，X(z)的分子分母都按z的升幂排列。
D.
对X(z)幂级数展开后，用数学归纳法将所得序列表示成一个闭合表。
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参考答案：
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【单选题】For trade  terms  in Group  C , after departure , the risks  of, losses  of or damages  to the goods are borne ______.
A.
the seller          
B.
the buyer          
C.
the carner        
D.
the ship owner
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【单选题】一般规定 电话铃声响了几声接听电话 ( )。
A.
1
B.
2
C.
3
D.
4
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【判断题】The WTO's dispute settlement procedure aims to resolve trade disputes through impartial panels after they start trade wars.( )
A.
正确
B.
错误
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【单选题】He would have gone to visit Linda yesterday, however , he _____on by Linda instead.
A.
was called
B.
called
C.
would be called
D.
has been called
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【判断题】According to international trade practice ,  a contract may only be suspended after a force majeure event occurs.
A.
正确
B.
错误
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【简答题】Thousands of people have been killed in a massive(大规模的) earthquake in Japan. The quake -- the most powerful to hit Japan in more than 100 years -- caused massive damage and many people are missing and...
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【单选题】After some shipments are refused to be imported, ______.
A.
trade is going down all the way
B.
people sign trade on time
C.
goods are getting more expensive
D.
merchants try risking trading again.
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【多选题】下列 可 能成为商品学 研究内容的是
A.
商品价值的形成
B.
商品的储存和运输
C.
商品的分类与品种
D.
商品、资源与环境
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【简答题】A．Linda likes living in different places. B．He is surprised to hear the news. C．Linda cannot stay long in one job. D．He is about to change his job as well.
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【单选题】For trade  terms  in Group  C , after departure , the risks  of, losses  of or damages  to the goods are borne ______.
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【单选题】He would have gone to visit Linda yesterday, however , he _____on by Linda instead.
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B.
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C.
would be called
D.
has been called
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【判断题】According to international trade practice ,  a contract may only be suspended after a force majeure event occurs.
A.
正确
B.
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【简答题】Thousands of people have been killed in a massive(大规模的) earthquake in Japan. The quake -- the most powerful to hit Japan in more than 100 years -- caused massive damage and many people are missing and...
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【单选题】After some shipments are refused to be imported, ______.
A.
trade is going down all the way
B.
people sign trade on time
C.
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D.
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查看完整题目与答案
【多选题】下列 可 能成为商品学 研究内容的是
A.
商品价值的形成
B.
商品的储存和运输
C.
商品的分类与品种
D.
商品、资源与环境
查看完整题目与答案
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