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问题 填空题

当接触浓度超过PC-TWA，达到PC-STEL水平时，一次持续接触时间不应超过（）min，每个工作日接触次数不应超过4次，相继接触的间隔时间不应短于60min。

答案

参考答案：15

单项选择题

咳声短促，连续不断，咳后有鸡鸣样同声称为( )

A．顿咳

B．肺痨

C．肺痈

D．肺痿

E．白喉
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改错题
此题要求改正所给短文中的错误。对标有题号的每一行作出判断：如无错误，在该行右边横线上画
一个勾（√）；如有错误（每行只有一个错误），则按下列情况改正：
此行多一个词：把多余的词用斜线划掉，在该行右边横线上写出该词，并也用斜线划掉。
此行缺一个词：在缺词处加一个漏字符号（∧），在该行右边横线上写出该加的词。
此行错一个词：在错的词下画一横线，在该行右边横线上写出改正后的词。
注意：原行没有错的不要改。
    One day, I was cooking in the kitchen as the        
telephone rings. I went to answer it immediately.   
She was my close friend, Lisa. When we were talking   
on a phone, the fire alarm sounded. I ran back to the  
kitchen. The room full of smoke and the beef was badly 
burnt. I quickly turned off the gas, opening all the   
windows, and then went out of the house. In my      
surprise, two fire engines were outside his house. I   
was rather worried. I told about the firemen that it   
was my careless cooking which caused the heavy smoke.  		1._________        
2._________      
3._________         
4._________    
5._________                                              
6._________        
7._________       
8._________        
9._________          
10._________     
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