发生有毒气体泄漏时，什么情况下可以使用过滤式防毒面具（） A.空气中氧气的体积浓度高

下列X线征象中，可作为食管静脉曲张与食管癌的鉴别要点的是（）

A.充盈缺损

B.管腔边缘凹凸不平

C.钡剂通过缓慢

D.管壁仍见扩张与收缩现象

E.纵行黏膜皱襞消失

短文改错。

     文中共有10处语言错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏词符号，并在其下面写出该加的词。

     删除：把多余的词用斜线(／)划掉。

     修改：在错的词下划一横线(___)，并在该词下面写出修改后的词。

     注意：1. 每处错误及修改均仅限一词;

                 2. 只允许修改10处,多者(从第11处起)不计分。

     One day, I was cooking in the kitchen as the telephone rang. I went to answer 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 beef was badly burnt. I quickly turned off the

gas, opening all the windows, and then went out of the house. With my surprise, two fire engines

were outside of my house. I was rather worried. I told about the firemen that it was my careless

cooking which caused the heavy smoke.

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瓦斯抽放的主要目的是什么？

渴喜热饮而量不多，或水入即吐多为

A、湿热内蕴

B、痰饮内停

C、营分热盛

D、阴虚津亏

E、瘀血内阻

国际环境法实施的经济刺激措施有（）

A.保险

B.弹性许可证

C.联合履约

D.标志

E.报告