问题 问答题 简答题

连拱隧道开挖方法是什么?

答案

参考答案:

完整性较差的Ⅳ、Ⅴ级围岩和部分Ⅵ级的软弱围岩宜采用三导坑法施工,先中导坑开挖并浇筑中隔墙,再开挖两侧导坑。完整性较好的Ⅲ级围岩主洞施工采用台阶法,Ⅲ级以上围岩主洞施下可采用全断面开挖。

完形填空
完形填空。
    It is very important to stay healthy. I have a neighbor. Sheis an old lady. She can do all thehousework,
   1   newspapers,watch TV and search on theInternet to learn somethingnew. I often see   2   do taijiquan in themorning and dance in the evening. She looksyoung and beautiful    3    she is over seventy.Last week a
reporter from a magazineinterviewed her and asked 4  she kept soyoung and healthy. She replied with a
smile.
    I have a secret of staying young andhealthy. It is quite    5   . Keep your mindactive, take an interest in
the world   6   you,and learn at least one new thing every day. Tryto do different kinds of housework and
dosports as   7   as you can. Don't think you aretoo old to go back to    8    .I know a man whoentered a medical college when he was 70 yearsold. He studied there for 6 years and now he is adoctor. Another
man went to a tennis school atthe age of 71 and now he is  good  at    9 _tennis. Some  people  may say
staying young iseasy only for those who live in the future. Infact, no matter how old you are, you can make it.  
   Please. tell the story to your family. Itwould be a good start to   10   the lady'sexample. I hope all people will  stay  young andhealthy.
( )1. A. look  
( )2. A. her    
( )3. A. than  
( )4. A. what  
( )5. A. early  
( )6. A. under  
( )7. A. soon  
( )8. A. place  
( )9. A. buying
( )10. A. follow
B. read  
B. him    
B. since  
B. why    
B. dear  
B. around
B. busily
B. song  
B. losing
B. give  
C. see    
C. other  
C. though  
C. who    
C. easy    
C. above  
C. hardly  
C. school  
C. sending
C. make    
D. watch    
D. others    
D. because  
D. how      
D.late      
D. between  
D. often    
D. dance    
D. playing  
D. bring    
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