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【简答题】
为什么从计量经济学模型得到的预测值不是一个确定的值?预测值的置信区间和置信度的含义是什么?在相同的置信度下如何才能缩小置信区间?
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举一反三
【单选题】After _____ the league, he often helps others. [ ]
A.
joining in
B.
joining
C.
joined
D.
joined in
【单选题】Thank you for _____________ CCTV’s Around The World show.
A.
join
B.
is joining
C.
to join
D.
joining
【多选题】Which are the roles for the UNICEF Ambassador of Goodwill?
A.
He makes public appearances and talks.
B.
He pays visits to troubled regions.
C.
He takes use of his political access to advocate UNICEF causes.
D.
He attracts attention from celebrities.
【单选题】The following are job benefits by joining Toastmasters EXCEPT______.
A.
becoming familiar with various means of communication
B.
learning how to deliver messages in an organized way
C.
becoming aware of audience expectations
D.
learning how to get along with friends
【简答题】社会保障制度产生和发展分几个阶段？各阶段的主要标志是什么？
【单选题】Thank you for _____ the school play. [ ]
A.
joining
B.
to join
C.
joins
D.
is joining
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