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问题 多项选择题

关于分层抽样叙述哪些是正确（）

A.抽样误差较小

B.样本代表性好

C.需要知道总体的数量

D.样本在总体中分布均匀

E.样本分布存在某种规律性时不宜使用

答案

参考答案：A, B

填空题

看图阅读下面短文，将短文补充完整

     It was Saturday. Han Mei needn't    1    to school. But    2    was busy with housework. After she got    3   , she first helped her mummy with the    4   . Then she went shopping with a    5   . In the market she    6    some meat, eggs, tomatoes and some other vegetables. Later in the afternoon she had to    7    supper for the whole family. In the evening she sat at the    8    and did her    9    for one and a half    10   .  After she finished it, she went to bed.
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多项选择题

CS漫游方案配置步骤为（）

A.创建电路域漫游方案

B.创建漫游VLR

C.创建漫游方案VLR

D.受理台签约漫游方案
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