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单项选择题

2-4-9、序列的Z变换为（ ）。 A.
B.
C.
D.

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单项选择题
Civilians must complete Basic Security in the Field (BSITF): A.
During the mission. B.
Prior to their travel to the mission. C.
After taking Advanced Security in the Field (ASITF). D.
After they have completed the mission.
单项选择题
银行存款按复利计算，本金为10000元，年利率为3%时，该笔存款两年后的本利和为（   ）.
A、
10600
B、10300
C、
D、
判断题
把目的地国家的海关违禁品事先告诉游客是领队的责任和义务。
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