问题 多项选择题

采用实测曲线拟合法判定桩承载力时,下列哪些规定是正确的()

A、所采用的力学模型应明确合理,桩和土的力学模型应能分别反映桩和土的实际力学性状,模型参数的取值范围应能限定

B、对于柴油锤打桩信号,曲线拟合时间段长度在t1+2L/c时刻后延续时间不应小于30ms

C、桩单元的最大计算位移值不应超过土的最大弹性位移值

D、拟合完成时,土阻力响应区段的计算曲线与实测曲线应基本吻合,其他区段的曲线应吻合E、最大动位移的计算值应与实测值接近

答案

参考答案:A, B

阅读理解

阅读理解。

     I have a good friend. His name is Jim. Jim is an English boy. He comes to China with his parents.

They come to China to work. Jim comes here to study. He is in No. 5 Middle School.      

     He is never (从不)  late for school.  He studies hard at school. He can read and write English well.  

He can also speak a little French. He often helps us with our English, and we help him with his Chinese.

After class he likes playing football, swimming and running. He makes many friends here. We are glad to

stay with him.

     On weekends he often helps his mother clean the house, do some housework or do some shopping.

He likes living here. He thinks Chinese food is very good. He likes Chinese students very much. We all

like him, too.

1. Where is Jim from?         

A. France.                      

B. China.         

C. The UK.                     

D. The US.

2. Why do Jim's parents come to China?         

A. Because they want to study.         

B. Because they come to China to work.         

C. Because China is interesting.         

D. Because they like Chinese food.

3. Jim is good at _____.       

A. Chinese                      

B. English         

C. French                      

D. math

4. What doesn't Jim often do on weekends?         

A. Help his mother clean the house.         

B. Do some housework.         

C. Play computer games.         

D. Do some shopping.

5. Which of the following is NOT right?        

A. Jim often helps his mother.         

B. Jim likes Chinese food.

C. Jim is a popular student.

D. Jim doesn't like going shopping.

单项选择题