八卦中，（）象征山。 A.乾 B.坤 C.震 D.艮

若求cos54°17′20″的值，其按键顺序是______．

选择句子,补全对话, 其中有两项是多余的。

A: Hello, sir, may I talk with you in English?

B: Of course.

A: I have learned English at school for one year. I have very few chances to talk with the

    English-speaking people. 1. _____

B: Oh, you speak English very well.

A: Thank you. By the way, 2. _____

B: No, I'm not. 3. _____

A: How long have you been in this city?

B: 4. ____ 

A: I see. Do you like this city?

B: Yes. I like it very much. It's a beautiful city.

A: Thank you. 5. _____ 

A. are you a student from America?

B. Not good.

C. So I want to practice English.

D. I’ve lived here since three weeks ago.

E. I’m a student from Australia.

F. Do you like it?

G. I’m glad you like it.

中暑易发生的环境是（）

A.高温

B.高湿度

C.通风不良

D.长时间烈日下劳动

E.长时间从事繁重的体力劳动

表现为非典型性肺炎的是

A．吸人性肺炎

B．病毒性肺炎

C．手术后肺炎

D．麻疹后肺炎

E．坠积性肺炎

罩式炉松卷退火时，带钢表面质量比紧卷退火时（）。

A.好

B.差

C.一样

D.无明显差别