问题 选择题

关于理想气体,下列说法正确的是(   )

A.温度越高,气体分子平均动能越大

B.气体压强跟分子平均动能和分子密集程度有关

C.一定质量理想气体,压强增大内能不变是不可能的

D.压强相同,气体分子对器壁单位面积单位时间内的冲量不一定相同

答案

AB

温度是平均动能的标志,温度越高,气体分子平均动能越大,A正确;根据气体压强的微观解释知,气体压强的大小跟两个因素有关:一是分子平均动能,一个是分子密集程度,B正确;理想气体的内能与温度有关,压强增大,温度并不一定变化,C错误;压强相同,气体分子对器壁单位面积单位时间内的撞击力相同,则冲量一定相同,D错误。

填空题

阅读下面短文,根据短文内容及首字母提示补全文中所缺的单词。

     Years ago ,if a teenager had some problems in his life,he might write them in his diary (日记). Now a

teenager (1)w____   the same problems might get on the Internet and write them in his blog(博客). In

many ways, a diary and a blog are almost the same. So, what makes a blog (2)d____  from a diary?    

     The biggest difference is that a blog is much more public(公共的)  (3)t____  a diary. Usually,a

teenager likes hiding his diary book and treats it as one full of (4)s____  .Both diaries and blogs tell what

happened to the writer that day.    

     A blog has both good and bad points(特点). The biggest problem is that anyone can read what you

write in your blog. If you are not satistied(满意的)with a friend during school and write something bad

about him in your diary , he will never know it. (5)H____  , if you do this on the Internet, that friend may

read your blog and get (6)a____ . So we have to be careful of what we write.     

     A blog has good points, of course. People choose to write in blogs,they know that their friends will

read what they write. If you are  (7)f____ sad one day and write in your diary, no one will know about it.

If you write the same words in your blog, your friends may quickly (8)w____ back to comfort you or offer their help. Blogs help people stay in close contact(联系)and let them know what their friends are doing.

     T(9)____  it's a good way to write blogs about everyday life,I still (10)p____ my old diary.

1.________  2.________  3.________ 4.________  5.  ________

6.________ 7. ________  8.________ 9.________ 10. ________

多项选择题