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问题 单项选择题

标准气钢瓶中组分的沸点、粘度相差较大时，钢瓶应定期（）。

A、滚动

B、倒置

C、更换

D、试压

答案

参考答案：B

改错题
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     This winter, my mother and I go back to my   
Hometown to celebrate a Spring Festival    
Together with my grandmother.           
     Having been away to my hometown       
for several year, I knew very little     
about them. I was surprised to find      
which great changes had taken place there.  
I met much of my old friends and        
play together with them. I also learned a lot 
during my stay here. Summer holiday is coming
, or I am going to spend my holiday there.   		1______
2______

3______
4______
5______
6______
7______
8______
9______
10______
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