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【单选题】
下列关于z变换收敛域的说法，正确的是A.
z变换的 收敛域是指使 z 变换定义式对应的级数收敛的序列 n 的取值范围。
B.
序列的 z 变换存在，则其 DTFT 一定存在。
C.
若序列的 z 变换收敛域包含单位圆，则其 DTFT 一定存在。
D.
若已知序列 x[n] 为因果序列，则其收敛域一定存在且在某个圆之外。
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【简答题】The exhibition of the European Single Market aims to foster and extend the sp______ of European friendship.
【单选题】关于爆炸品生产厂房、储存库房和销毁场地的平面布置，下列说法错误的是( )。
A.
主厂区内按危险和非危险分区布置规划
B.
总仓库远离工厂和城市
C.
销毁场所选择山沟、河滩等地方
D.
主厂区布置在非危险区的上风侧
【判断题】Proto-Indo-European is believed to be the ancestor of most European languages, such as Greek, German, Spanish, French and Italian.()
A.
正确
B.
错误
【简答题】Jenny was an English. She was a good girl 1 she was often late for school.One morning she was late again.Mr Black,her teacher,was angry with her when she came into the classroom. "I'll write to your f...
【单选题】关于爆炸品生产厂房、储存库房和销毁场地的平面布置，下列说法错误的是（ ）
A.
方厂区内按危险和非危险分区布置规划
B.
总仓库远离工厂的城市
C.
销毁所选择山沟河滩等地方
D.
主厂区布置在非危险区的上区侧
【单选题】关于爆炸品生产厂房、储存库房和销毁场地的平面布置，下列说法错误的是（ ）
A.
方厂区内按危险和非危险分区布置规划
B.
总仓库远离工厂的城市
C.
销毁所选择山沟河滩等地方 D主厂区布置在非危险区的上区侧
【简答题】听下面一段材料，回答第1-3 题。 1. Why was Paul angry with Jane? A. She told the others about his salary. B. She told Mrs. Wallace his salary. C. She always talks to everybody. 2. Why did Jane tell Mrs. Wallace the...
【简答题】1 She got angry with us and __________ (leave) the room without saying goodbye.
【单选题】The European Union(EU)is an organization of 15（）that promotes cooperation among its members.A.European countries
A.
European countries
B.
developed countries
C.
Western European countries
D.
Southern European countries
【单选题】The core of the European monetary system is()
A.
European exchange rate mechanism
B.
European monetary unit
C.
European monetary fund
D.
European central bank
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