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问题 单项选择题

设样本（X1，X2，…，XN）是抽自正态总体N（600，102），则服从下列（）项所述的分布。

A．N(600,102)

B．N(600,1)

C．N(600,10)

D．N(600,50)

答案

参考答案：C

阅读理解

阅读理解。

     Bill is from the U.S.A. But his father (父亲), mother (母亲) and he are in China now. His mother is a

teacher. His father is a teacher, too. Bill is in Class 7, Grade 8. He is 13. His mother is my English teacher. I'm Zhang Jun. I'm in Class 8, Grade 7. I'm 13, too.

1. Bill's family (家庭) is from _____.

A. the U.S.A.

B. China

C. Japan

2. Who is in Grade 8?

A. Li Lei.

B. Bill.

C. His mother.

3. Who is in Class 8?

A. Zhang Jun.

B. Bill.

C. His mother.

4. How old is Bill?

A. 7.

B. 8.

C. 13.

5. Are Zhang Jun and Bill the same age (同龄)?

A. Yes, he is.

B. Yes, they are.

C. No, they aren't.
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单项选择题

如果定义了一个类myclass，则为myclass类对象以成员函数形式重载后++运算符的声明应该为( )。

A．myclass operator ++()；

B．myelass& operator ++()；

C．myclass operator++(in；

D．myclass& operator++(in；
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