零部件的疲劳极限，受( )因素的影响。A．零件尺寸 B．应力幅 C．表面状态 D．

阅读理解。

     Hello, nice to meet you. My name is David and I'm a student at Beijing International School. This is a

photo of my family. These are my parents and my little sister is behind me. We're from America and we're

in China now. My father and my mother are teachers in a university in Beijing. My mother is an English

teacher, and she can speak Chinese. My father can't speak Chinese. My little sister is only three but she

can dance.

1. ______ is a student at Beijing International School. 

A. David

B. David's sister

C. David's brother

D. David's parents

2. There are ______ people in David's family.

A. three

B. four

C. five

D. six

3. David's parents are ______.

A. doctors

B. teachers

C. workers

D. managers

4. Who can speak Chinese?

A. David's sister.

B. David's father.

C. David's mother.

D. We don't know.

5. David's sister can ______.

A. swim

B. sing

C. type

D. dance

细胞间液与血浆组成成分的主要差别是（）

A.阴离子种类

B.阴离子含量

C.阳离子种类

D.阳离子含量

E.蛋白质含量

古浪县确立并全面实施的发展战略是（）。

A.强工富农

B.生态立县

C.核心带动

D.舍饲养殖

E.人力资源开发

在AutoChief C20型主机遥控系统中，AutoChief控制面板的显示窗口（）。

A.只能显示文本信息和流程图

B.只能显示文本信息和模拟仪表图

C.只能条形图和流程图

D.既能显示显示文本信息，也能显示流程图、模拟仪表图和条形图

制定透平的单机试运行方案（主要步骤）。