问题 问答题 简答题

简述皮肤散热方式有哪些?

答案

参考答案:

皮肤散热的方式有四种:

1.辐射是机体把热量直接放射到周围环境中去的一种散热方式。

2.对流机体的热量把周围的冷空气变热,热空气上升,而较冷的空气又流进来补充,这样借助空气的流动而放散体热的方式,叫对流散热。

3.传导机体与物体直接接触时,也能把热量传导出去,这种方式叫传导散热。

4.蒸发水变成水蒸气时,要吸收一定的热量,蒸发1克水常要带走0.58千卡的热量。所以,由皮肤表面蒸发水分和由呼吸道呼出水蒸气是机体散热的有效方式。

阅读理解

阅读理解

      Dave and Bob like playing very much. They often came up to the city from the country on Sundays to do some shopping, had a meal and then went to the theatre in the evening.    

      One evening it was twenty-five past eight and they were waiting for the play to begin. The theatre was  full. Everyone was laughing, talking and eating something. Soon the red curtain(幕) went slowly up, the       lights in the theatre went out(熄灭 ) and the play began. Then everyone was quiet. They watched, listened and thought. But it was a sad play. Dave and Bob didn't like it.      

      Last Sunday they saw a happy one and liked it. After the play Dave and Bob took the last train to        leave the city at ten past twelve.

1. Dave and Bob often went to         .    

A. the city from the village on Saturdays    

B. the country from the town on Sundays    

C. the city from the country on Sundays    

D. the theatre from the shop on Sundays

2. They went to the theatre in the evening        .    

A. before they did some shopping    

B. after they had a meal    

C. before they had a meal    

D. in the country

3. The theatre is full of          .  

A. talking              

B. laughing    

C. eating                

D. people

4. When the lights in the theatre went out,the people         .    

A. were quiet            

B. stood up    

C. began to talk          

D. went out of the theatre

5. They enjoyed going        .    

A. to the theatre to see a happy play    

B. to the theatre to see a sad play    

C. to the country to do some shopping    

D. to the country to have a meal

单项选择题