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问题 单项选择题

假如混凝土的设计强度20MPa，平均强度23.2MPa，施工标准差由2.66MPa增大为4MPa，那么混凝土保证率会（）。

A.提高

B.降低

C.基本不变

D.无法计算

答案

参考答案：B

连线题
连词组。
1. go to            
2. go              
3. eat              
4. play            
5. get              
6. visit            
7. do              
8. have        		dinner          
bed              
home            
up              
the piano        
English class    
grandma          
morning exercises
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选择题

Mrs. Smith has tried many times to persuade her husband to give          smoking, but Mr. Smith wouldn’t listen, Finally Mrs. Smith had to give          and let him be.

A．in; in

B．up; up

C．up; in

D．in; up
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