水合物的形成会造成上游天然气压力（）较大，引起不安全事故发生，损坏设备和伤及人员。

酒精灯的火焰分______部分，______温度最高，______温度较低，______温度最低．所以在给物质加热时应用酒精灯的______加热．

下述肺血增多X线表现，错误的是（）

A.肺纹理增多

B.肺动脉段搏动增强

C.右下肺动脉影可增粗

D.肺透亮度正常

E.心腰凹陷

根据中文提示或所给单词，写出正确的单词 （每空1分，共10分）

1. The ____________(交通) light is green. You can cross the street.

2. Many students in our class have poor ___________(视力) and they have to wear glasses.

3. Xu Xiake is ________________(出名的) in China.

4. Do you know the __________(重量) of the elephant?          

5. My uncle doesn’t like ______________( 西方的) food .

6. —Whose watches are these?   —They’re the _________ (swim) .

7. Take good care of _____________(you) when you go on a trip , boys and girls.

8. Yesterday he did his homework ____________(careful) and made many mistakes. His teacher was very unhappy.

9. After taking the medicine, he felt even _______________(bad). So he had to stay in bed .

10. He often tells us funny jokes to make us ________________ (please) .

请描述ClearCase的特点？

成人在秋季的睡眠时间应保证在8小时以上。（）