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问题 多项选择题

负荷预测考虑的气象因素包括（）等。

A.温度

B.湿度

C.降雨量

D.舒适度

答案

参考答案：A, B, C, D

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       Vitamins(维生素)  are a discovery of the 20th century. A hundred years  1   , no one knew
anything   2   them. The vitamins are   3   by letters of alphabet. Vitamin A   4   by the eyes. There
is vitamin A in milk, butter and green vegetables It   5   by the body.
       Vitanun B must be supplied (提供)  6   by some of our food. The skins  7   grains of all sorts
have vitamin B in them.
       Vitamin C is very important   8_ the body. Without it   9   teeth will become loose and their
arms and legs become weak. Oranges and tomatoes   10   vitamin C in them.
       There are other vitamins.  But these A, B,C are the most important.
( )1. A. before
( )2. A. about  
( )3. A. naming
( )4. A. needs  
( )5. A. stores
( )6. A. times  
( )7. A. of    
( )8. A. in    
( )9. A. people
( )10.A. has    		B. front        
B. of          
B. named        
B. need        
B. be stored    
B. in not time  
B. to          
B. at          
B. peoples'    
B. have          		C. ago          
C. in            
C. is named      
C. is needed    
C. can store    
C. all the time  
C. on            
C. with          
C. people's      
C. there is       		D. ahead          
D. for            
D. names          
D. was needed    
D. can be stored  
D. any times      
D. in            
D. to            
D. peoples        
D. there are      
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选择题

将2.7g Al与100mL 2 mol/L H2SO4溶液充分反应后，再慢慢滴入25mL 4mol/LNaOH溶液，其结果是:（  ）

A．所得溶液的pH<7

B．溶液中有较多Al(OH)3沉淀

C．取少量所得溶液，加NaHCO3，无明显现象发生

D．另取少量所得溶液，加入几滴浓NaOH溶液，无明显变化
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