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【单选题】
（ ）能确切地说明数据分布的离散程度和波动规律，是最常用的反映数据变异程度的特征值。A.
算术平均值
B.
极差
C.
标准偏差
D.
变异系数
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举一反三
【单选题】---- How do you find his work?---- _____________.
A.
I find it by accident
B.
Well done
C.
Sorry, it’s out of order
D.
No wonder, here it is
【单选题】Our math teacher will only give us 5 minutes______ this problem. [ ]
A.
find out
B.
work out
C.
to give out
D.
to work out
【简答题】A.Work out a plan to tighten his budget. B.Find out the opening hours of the cafeteria. C.Apply for a senior position in the restaurant. D.Solve his problem by doing a part-time job.
【单选题】Can you help me to ___ this mathematic problem?
A.
do out
B.
work out
C.
find out
D.
deal out
【简答题】A．Work out a plan to tighten his budget. B．Find out the opening hours of the cafeteria. C．Apply for a senior position in the restaurant. D．Solve his problem by doing a part-time job.
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