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【多选题】
15 设X 服从二项分布 ，且 则A.
1/6
B.
36
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【单选题】Why does Miller especially admire about Blaise Cendrars?
A.
He had a very adventurous life.
B.
He was a great writer.
C.
He knew what to do with his time.
D.
He read as well as wrote a lot.
【简答题】请在下图的 5G NR 网络拓扑中填入必要的网元名称及接口(填写英文缩写) 注:请填写英文缩写
【单选题】Why does Miller hope the star system still exists in public libraries?
A.
It is an efficient system which works well.
B.
It discourages people from reading inappropriate books.
C.
It makes people interested in reading.
D.
It makes it easier for people to recognize books.
【简答题】Why does Miller
hope the star system still exists in public libraries?A. It is an efficient system which works well. B. It discourages people from reading inappropriate books. C. It makes people inter...
【单选题】下列对主关键字段的叙述,错误的是
A.
数据库中的每个表都必须有一个主关键字段
B.
主关键字段值是惟一的
C.
主关键字可以是一个字段也可以是一组字段
D.
主关键字段中不许有重复值和空值
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