横截面积S=3dm2的圆筒内装有质量m=0.6kg的水,被太阳光垂直照射2min

题型:问答题

问题:

横截面积S=3dm2的圆筒内装有质量m=0.6kg的水,被太阳光垂直照射2min,水的温度升高了1℃.设大气顶层的太阳能只有45%到达地面,太阳与地球之间的平均距离为1.5×1011m,试估算出太阳的全部辐射功率是多少?(已知水的比热容c=4200J/kg℃.保留1为有效数字)

考点:能量转化与守恒定律
题型:问答题

阅读理解。

     It is a fine Sunday morning. There are a lot of children near the river. They are students of Grade

One of No. 15 Middle School. There are two teachers with them. All of the students are Young

Pioneers. They are having their Young Pioneers' Day.What are they doing? They are planting trees

(树) and flowers (花). Some of the boys are carrying (背) new trees; some are planting them. Some

of the girls are carrying water; some are watering (浇水) new trees. The teachers are helping them.

1. Who's near the river?

A. Many students.

B. Two teachers.

C. Many students and two teachers.

D. Many boys.

2. Are the students in the same class?

A. Yes, they are.

B. No, they aren't.

C. We don't know.

D. No, they are.

3. What are they doing?

A. They are working.

B. They are playing.

C. They are having lessons.

D. They are planting trees.

4. The new word "plant" means _____.

A. 砍伐

B. 保护

C. 种植园

D. 植物

5. What are the teacher doing?

A. They are helping the new trees.

B. They are helping their students plant trees.

C. They are helping their students do homework.

D. They are watching.

题型:问答题
完形填空。
     I work in a school library. There are many kinds of   1   in it. For example (例如), books   2  
English, science, history, music, and so on.  You   3    do some reading or borrow books from it.  But
there are some   4  .You must obey (遵守) them.    
    When you are reading in the library, you have to   5   quiet. Don't talk loudly   6   make any noise.
You can't listen to music,  7 .  You   8    take your bags or wet umbrellas into the library.   9   or
drink in the 1ibrary. You can borrow books from the library, but you can't   10  them to others. You
have to take good care of (好好保管) them and return them on time (按时归还).  If the library books
are lost, you have to pay for them.
( )1. A. people    
( )2. A. about    
( )3. A. can      
( )4. A. magazines
( )5. A. /        
( )6. A. and      
( )7. A. also      
( )8. A. aren't    
( )9. A. No eating
( )10. A. lent    
B. books    
B. in      
B. have to  
B. rules    
B. are      
B. but      
B. either  
B. don't    
B. Not cat  
B. lended  
C. magazines
C. at        
C. can't    
C. CDs      
C. be        
C. or        
C. too      
C. can      
C. Don't eat
C. lends    
D. newspapers
D. from      
D. don't      
D. questions  
D. have                          
D. because    
D. and        
D. can't      
D. Can't eat  
D. lend      
题型:问答题

在下面四个词语中选择合乎句子语义要求的词语填空

震撼 迸溅 稀零 震动

①那一声声沉稳而有规律的跳动,给我极大的(  )

②紫色的大条幅上,泛着点点银光,就像(  )的水花

题型:问答题

科学发展观,第一要义是发展,核心是________,基本要求是全面协调可持续,根本方法是统筹兼顾。[ ]

A、以人为本

B、自主创新

C、三个代表

题型:问答题

第二次鸦片战争期间,英国炮舰溯江而上,迫使清政府将地处内地的()辟为外国通商的口岸。

A.九江

B.汉阳

C.汉口

D.南昌

E.宜昌

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