一组数据5,4,3,2,1的标准差是______.

题型:填空题

问题:

一组数据5,4,3,2,1的标准差是______.

考点:方差
题型:填空题

阅读理解。   

     My name is Bruce. I'm a boy. I'm from Canada. I live in Beijing now. This is my friend. His name is

Jack. He is in Beijing, too. But he isn't in my school. He is my good friend. Look, that boy is Tom and

that girl is Mary. Tom and Mary are my friends. I have a book in my hand. I borrow this book from the

library. I like books!

根据短文内容,选择正确答案。

1. Bruce lives in ________.

A. Canada

B. China  

C. England

D. America

2. Jack is a ________.

A. girl  

B. teacher  

C. boy  

D. cat

3. Bruce has ________ friends.

A. one  

B. two

C. three

D. four

4. Bruce has a ________ in his hand.

A. pen

B. book

C. pencil

D. marker

5. The book is from ________.

A. my school

B. Tom  

C. Mary

D. the library

题型:填空题

配煤的粘结性和什么有关?

题型:填空题

根据《治安管理处罚法》的规定,对精神病人在不能辨认或者不能控制自己行为的时候违反治安管理的,应当( )。

A.从轻处罚
B.减轻处罚
C.免予处罚
D.不予处罚

题型:填空题

原理工艺流程图只是为了说明系统的工艺原理,不可作为倒换流程对照操作阀门之用。

题型:填空题

架空线的材质有()。

A.铁合金

B.铝合金

C.铜

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