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问题 单项选择题

对于结构跨度为2.5 m的悬臂构件，底模拆模时要求混凝土强度为相应混凝土强度标准值的______。

A．50%

B．75%

C．85%

D．100%

答案

参考答案：D

完形填空
完形填空。
     Tom was eight   1   , and he went to   2    near his house. He could go there and came home   3   bus
every day, but he always went to school and came home   4   foot. He usually came back on time. But last
Friday he came home late from school.When his mother   5   him, she said, "Why are you   6   today, Tom?"
"My teacher was angry( 生气 ) and made me   7   behind," Tom answered."   8   did she made you stay
behind?" " Because she asked a question in class," Tom said, "And   9   in class gave her the answer except( 除……之外) me ,"His mother wasn't clear (明白). "but why did the teacher make you stay behind? Why
  10  she make all the other children stay behind?" She asked Tom,"Because she asked, 'Who put glue (胶水)
on my chair?'"
( )1. A. year old  
( )2. A. the school
( )3. A. by        
( )4. A. by        
( )5. A. saw       
( )6. A. late      
( )7. A. stay      
( )8. A. When      
( )9. A. anybody   
( )10. A. did       		B. years old   
B. a school    
B. on          
B. on          
B. see         
B. early       
B. to stay     
B. Where       
B. somebody    
B. will      		C. year-old  
C. that school
C. after     
C. after     
C. looked    
C. later     
C. keep      
C. Why       
C. everybody   
C. didn’t   		D. years    
D. school   
D. in       
D. in       
D. look     
D. earlier  
D. to keep  
D. Because
D. nobody   
D. won’t
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选择题

把足量的铁粉投入到溶解有硫酸和硫酸铜的溶液中，充分反应后，剩余金属粉末的质量与原加入铁粉的质量相等，则原溶液中H+与SO42-的物质的量浓度之比为 [ ]

A.1:4

B.2:7

C.1:2

D.3:8

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