下列各组数中，可以构成直角三角形的一组是（） A．2，5，6 _爱下问搜题

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问题选择题

下列各组数中，可以构成直角三角形的一组是（　　）

A．2，5，6

B．2，3，4

C．6，7，9

D．1.5，2，2.5

答案

答案：D

完形填空

完形填空.

Zhang Wei is a Chinese _1_. He is not young, but he is not _2_. He is twenty-eight. He has a son. _3_ name is Zhang Lin. He is _4_. Mr. Zhang teaches English. _5_ his class there are thirty _6_. They all _7 him. His wife (妻子), _8_ Zhang, is a nurse (护士). She is _9_ mother.
Today is Sunday. _10_ is free (空闲) in Mr. Zhang's family.

(    )1. A. worker
(    )2. A. good
(    )3. A. He
(   )4. A. three
(   )5. A. At
(   )6. A. students
(    )7. A. likes
(    )8. A. Miss
(    )9. A. Mr. Zhang's
(   )10. A. Every

B. student
B. twenty
B. His
B. fifteen
B. On
B. boy
B. is like
B. Mr.
B. Zhang Lin
B. Every one

C. teacher
C. old
C. She
C. twenty-eight
C. In
C. girl
C. are like
C. Mrs.
C. Mr. Zhang
C. One

D. doctor
D. friend
D. Her
D. eighteen
D. Of
D. boy and girl
D. like
D. Mis.
D. Mr. Zhang's son's
D. All

单项选择题

数据库设计的四个阶段是：需求分析、概念设计、逻辑设计和【】

A．编码设计

B．测试阶段

C．运行阶段

D．物理设计