搜题请搜索小程序“爱下问搜题”
问题 单项选择题

下列有关经载体的易化扩散的特点，叙述错误的是

A．可逆浓度梯度进行

B．具有高度特异性

C．会出现饱和现象

D．会出现竞争性抑制

答案

参考答案：A

完形填空
完形填空。
     There is a   1   in our kitchen.There   2   some fruit in it to keep cool. But there aren't any apples    3   
bananas, so it's not   4   .We have   5   meat and vegetables in a bag. We like to   6   the meat and fish for
dinner. Near the bag are two boxes. The big   7   is a box of cakes. The small one is a box of tea. Behind
the boxes are five  8    . Mother loves   9  . She 10 to buy some other food this afternoon.
(    ) 1. A . table            
(    ) 2. A . is               
(    ) 3. A . so               
(    ) 4. A. small             
(    ) 5. A. not               
(    ) 6. A. bring             
(    ) 7. A. bag               
(    ) 8. A. bottles of oranges
(    ) 9. A. cook              
(    ) 10.A. will               		B. basket          
B. are             
B. but             
B. full            
B. many            
B. use             
B. one             
B. bottles of orange
B. cooking         
B. goes             		C. dish             
C. have             
C. or               
C. nice             
C. much             
C. take             
C. ones             
C. bottle of orange 
C. cook             
C. would like        		D. fridge           
D. has              
D. and              
D. heavy            
D. lots of          
D. have             
D. boxes            
D. bottle of oranges
D.  to cook         
D. like             
查看答案
单项选择题

非水碱量法测定硫酸奎宁时，硫酸奎宁与高氯酸的摩尔比

A．1∶1
B．l∶2
C．1∶4
D．l∶3
E．1∶6

查看答案