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【简答题】
设(X1，X2，…，Xn)为来自正态总体N(μ，σ2)的样本，其中μ，σ2未知，且0＜a＜b，又设随机区间 的长为L，求L的数学期望和方差．
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反馈参考答案：
举一反三
【简答题】简述不同绩效管理阶段绩效沟通的目的和侧重点，绩效沟通有那些技巧。
【单选题】What can you infer about some phone carders from the passage?
A.
They want to get additional download profit from teenagers.
B.
They are faced with intense competition in the market now.
C.
They try to expand the sales of phones among adult users.
D.
They provide some free minutes for the young people.
【简答题】反射原稿的质量要求包括哪些?
【简答题】简述护患沟通时有效倾听应注意的技巧。
【单选题】The big question that faces Doppelganger is
A.
whether they Can get additional venture capital from investment banks．
B.
whether they Can increase revenue from selling music downloads and band．related goods．
C.
whether they carl find suppliers to sell physical things in the Lounge．
D.
whether they Can develop a critical mass of users and attract mass．market advertisers．
【单选题】Where can listeners get additional information?
A.
At a project office.
B.
At a website.
C.
On 25th Street.
D.
At the Town Hall.
【简答题】简述有效沟通的四个技巧。
【单选题】49
A.
Lindbergh used this additional training to get a job as an airmail pilot, flying out of St. Louis, Missouri
B.
Working with an aviation company from San Diego, California,and with financial help from the city of St. Louis, Lindbergh got a customized(定制的)airplane that could make the journey
C.
He also received a Medal of Honor,the highest United States military decoration
D.
Eighty years ago,radio and movies were just beginning to have that kind of effect on Ameri- cans
E.
His childhood was not full of fond memories
F.
He quit school and moved to Nebraska where he learned to be a pilot
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