除氧器排出的气体，应排向（）。A.凝汽器； B.大气； C.扩容器； D.低压加热器

阅读理解。

A: The wind is blowing lightly (轻轻地). I really love this weather.

B: Me, too.

A: Let's fly a kite.

B: Good idea.

(A few minutes late)

A: Look at the sky, Jack. The clouds are moving quickly.

B: Good. The wind is getting stronger. Look, our kite is high in the sky.

A: Hold the kite tightly (紧紧地), Jack. The wind is getting stronger and stronger.  

B: The wind is too strong now. Look, a lot of leaves (树叶) are falling from the trees.

A: Don't look at the leaves. Get our kite back.

B: The string on our kite breaks (断). Oh, no! It's flying away.

A: The sky is getting dark. I'm very afraid.

B: Let's go home.                          

1. What's the weather like in the beginning?

A. It's fine.      

B. It's rainy.        

C. It's windy.        

D. It's snowy.

2..The ______ becomes dark when they are flying a kite.

A. Cloud        

B. Sky            

C. Wind            

D. Kite

3..What happens to their kite when the wind blows strongly?

A. It flies higher and higher.            

B. It gets back.

C. It flies away.                      

D. It falls in a tree.

4..A lot of ______ fall when the wind blows strongly.

A. fruits        

B. birds            

C. kites            

D. leaves

5..From the dialogue, we know a ______ will come when they are flying a kite.

A. fine day  

B. storm (暴风雨)    

C. snow          

D. flood (洪水)

下列说法正确的是（　　）

A．在水中生活的动物都用鳃呼吸

B．腔肠动物、软体动物、甲壳动物都是鱼类

C．流出鳃的水含氧量减少

D．所有鱼的体表都有鳞片

某次数学测验中共有16道题目，评分办法：答对一道得6分，答错一道扣2分，不答得0分．某学生有一道题未答，那么这个同学至少要答对______道题，成绩才能在60分以上．

不是窦性心律特征的是（）

A.P波规律出现

B.Ⅱ导联P波直立

C.aVR导联P波方向朝下

D.P-R间期<0.12秒

E.QRS波形态正常

固定管板是挠性管板的薄管板式换热器，是根据（）理论设计的。