试题与答案

用NA表示阿伏德罗常数，下列叙述正确的是（ ） A．标准状况下，22.4L酒精中

来源：www.tikuol.com
题型：选择题

题目：

用NA表示阿伏德罗常数，下列叙述正确的是（　　）

A．标准状况下，22.4 L酒精中含有的分子数为 NA

B．常温常压下，10.6 g Na2CO3固体中含有Na+个数为0.2 NA

C．25℃，1.01×105Pa下，NA 个CO2分子占有的体积为22.4 L

D．物质的量浓度为0.5 mol/L的MgCl2溶液中，含有Cl- 个数为 NA

答案：

被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0526/77126b070914dc6f262d8e2bc1da09c1.html

下面是错误答案，用来干扰机器的。

参考答案：B

考点：阿伏加德罗常数
试题推荐
题型：完形填空
完形填空。
     Laura lived in a small village near the sea. One day she decided to go for a swim in the sea. She knew
that the sea near the __1__ has a strong tide (浪) , but she was a good swimmer, so she wasn’t __2__.
Laura left her friends lying on the sands and ran into the sea.She swam quite far from the beach and waved(  挥舞  )to her friends in the distance.  After  a  short  while  she  decided to swim __3__. She tried her
best, but she couldn’t get any closer to the beach . The tide kept__4__her back. She waved her arms in
the air to let her friends know that she was__5__, but they just waved back, for they didn’t know what
she__6__. After a long time, Laura became very __7__ and she couldn’t swim any more. Her legs __8__and she lost hope. Suddenly, her foot touched __9__! All the time she had been swimming in a place
where the water wasn’t deep! When at last she went back to the beach, one of her friends asked, " Did
you _10_your swim?” “Yes, it was lovely.” She answered. She never told them what really happened.
(      )1. A town      
(      )2. A lonely    
(      )3. A up        
(      )4. A pulling  
(      )5. A in trouble
(      )6. A found    
(      )7. A hungry    
(      )8. A came up  
(      )9. A a tide    
(      )10. A enjoy    		B city        
B surprised  
B back        
B pushing    
B happy      
B meant      
B sleepy      
B were broken
B the sand    
B remember    		C village        
C interested    
C down          
C throwing      
C out of trouble
C said          
C thirsty        
C went down      
C a fish        
C drop           		D country            
D afraid              
D on                  
D putting            
D in the water        
D saw                
D tired                                   
D moved on            
D one of her friends  
D forget              
查看答案
微信公众账号搜索答案