什么是日中性植物?

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问题:

什么是日中性植物?

考点:植物生理学植物生理学综合练习植物生理学综合练习题库
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已知:cosα=
4
5
cosβ=
3
5
,0<α<π,且β∈(
2
,2π)
,则sin(α+β)的值为(  )
A.1B.-1C.-
7
25
D.-1或-
7
25
题型:问答题 简答题
完形填空   
     The seasons in Australia are the opposite of ours.   1   it is winter here, it is summer there.
     Australia is   2    the south of the world. July and August are the winter months. The summer is in
December, _  3    and February. The north of the country is    4    than the south.
     Australia' s main problem is water. A   5     large part of the country has no rain at all. But east
coast has the rain _6    the year round. There are no dry months here.
     In March 1982, there was a terrible drought in Australia. The summer rain didn't    7  . There were
138 million sheep in Australia this year. This was 14% of all the sheep in the world,
     Because there was no   8   rain, the grass didn't grow well, the farmers   9   to sell many of their
sheep and many sheep   10  , too. It was a great disaster for Australia farmers.
( )1. A. Because
( )2. A. in      
( )3. A. November
( )4. A. colder  
( )5. A. very    
( )6. A. whole  
( )7. A. have    
( )8. A. plenty  
( )9. A. heavy  
( )10. A. died  

B. Since  
B. on      
B. January
B. cooler  
B. so      
B. half    
B. fall    
B. a little
B. had    
B. dead    

C. When  
C. to    
C. March
C. hotter
C. too  
C. all  
C. give  
C. a lot
C. must  
C. death

D. For    
D. near  
D. October
D. warmer
D. much  
D. part  
D. keep  
D. enough
D. needed
D. dying  

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冯·诺伊曼结构的计算机有五大功能部件组成:运算器、控制器、______、输入设备和输出设备。

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带状疱疹最具特征性的临床表现是()

A.沿单侧周围神经分布的簇集性小水疱

B.神经痛

C.好发于皮肤黏膜交界处

D.红斑基础上簇集性的小水疱

E.躯体单侧分布的小脓疱

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