问题 多项选择题

有关爆炸危险场所的通风空调系统的设置要求正确的是()。

A.对空气中含有易燃、易爆危险物质的房间,其送、排风系统应选用防爆型的通风设备

B.当送风机布置在单独分隔的通风机房内且送风干管上设置防止回流设施时,可采用普通型的通风设备

C.对燃气锅炉房,应选用防爆型的事故排风机,且排风量满足换气次数不少于12次/h

D.对排除含有燃烧和爆炸危险粉尘的空气的排风机,在进入排风机前的除尘器宜采用可产生火花的除尘器

E.对排除有燃烧或爆炸危险气体、蒸汽和粉尘的排风系统和燃油或燃气锅炉房的机械通风设施,应设置导除静电的接地装置

答案

参考答案:A, B, C, E

解析:本题考查的是通风空调系统的设置。D错,对排除含有燃烧和爆炸危险粉尘的空气的排风机,检查在进入排风机前的除尘器是否采用不产生火花的除尘器;对于遇水可能形成爆炸的粉尘,严禁采用湿式除尘器。故此题答案选A、B、C、E。

单项选择题
阅读理解

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

I worked for a short time as a cashier(出纳员)at a restaurant a few months ago. 71  One night, just before Christmas, I found a large black wallet on the floor near one of the tables. I guess I should have checked it to find out who was the owner, but I was busy at the time. Also, I imagined that if the wallet contained anything valuable, the owner would be back.

An hour later a man came up to the counter(柜台). 72  I asked him to describe the lost wallet, and after he described it exactly, I gave him the wallet. He expressed his sincere thanks when I handed it to him. He asked me if I had opened it, and when I told him “ No”, he opened it right away and showed that it contained nearly $800 in cash (现金). 73  

“A reward for your honesty,” he said and then turned and walked away.

74  I began wondering whether I would have been so honest if I had known what was in the wallet! I thought that if there had been no way to find the owner and no one had returned to claim(认领)it, I might have kept it. But it also came into my mind that I had in fact saved someone’s Christmas plans by finding and returning the wallet. 75  The good feeling it gave me was worth more than anything money could  buy.

A.He looked quite worried and asked if anyone had found a wallet.

B.Later I thought about it again.

C.To my surprise, he took out a twenty–dollar bill and handed it to me.

D.So I didn’t return the wallet until the owner returned.E. I wanted to be honest, so I didn’t care much about money.

F. I also helped clear off the tables when it was especially busy.

G. For quite a long time I kept happy whenever I thought about it.