在房屋建筑工程室内排水系统中，通气管除具有排除污水中臭气、毒_爱下问搜题

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问题单项选择题

在房屋建筑工程室内排水系统中，通气管除具有排除污水中臭气、毒气的作用外，还有( )的作用。

A．保证排水器存水弯气压平衡

B．便于排除支管中气体

C．便于横向支管将污水引入到立管

D．便于将污水从立管引入到排水管

答案

参考答案：A

解析：本题考核点为房屋建筑工程排水系统中通气管的功能。通气管一般可用立管向上延伸穿出屋顶。管口设一金属丝网与大气相通。通气管的设置有两个作用：一是可排出污水中的臭气、毒气，二是可保证排水器存水弯气压平衡。

完形填空

A few years ago, when I was about 14,I went out for a walk 31 a rainy summer day. I saw a man 32 small, dirty colthes. He had 33umbrella, and he was picking bottles out of bushes. When he found 34 ,he smiled and put it in his big bag. I thought,“I wish there 35 some way to help him. Well, I could give him my umbrella.” Then I walked to him 36 gave the umbrella to him.“You need this more than I 37 .” The man took it with 38 big smile on his face and said,“Thank you! Thank you!” And then I walked away 39 good, I turned around and saw him 40a lot more, even though he was still picking bottles from bushes. “It was just an umbrella.” I thought, not 41 that it was the kindness 42 made him happy.
A few weeks later I was walking on a sunny day, and 43 the same man with the same clothes, 44 the same big bag 45 of bottles. The only 46 was that my umbrella was right in the corner, looking47 he cherished（爱护） it. It was so clean.
It didn’t 48 that I couldn’t give the man a house and a job and I only did I was able to do. But 50made someone else happier, so that was enough.

D．considering

D．rather than

单项选择题

《中药饮片质量标准通则<试行>》的通知规定根茎、藤木类，叶类含药屑、杂质不得超过

A．2%

B．3%

C．0.5%

D．5%

E．1%