酚二磺酸光度法测定水中硝酸盐氮时,水样若有颜色应如何处理?

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问题:

酚二磺酸光度法测定水中硝酸盐氮时,水样若有颜色应如何处理?

考点:水污染控制工程水污染控制工程题库
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人类需要洁净的空气,下列情况不会造成空气污染的是(  )

A.煤燃烧排放的烟尘

B.人呼出的二氧化碳

C.石油化工厂排放的废气

D.汽车排放的尾气

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阅读表达。

阅读下面短文,请根据短文后的要求进行答题.(请注意问题后的字数要求)

[1]Pupils at schools in the UK are being given lessons on how to sleep.The project,run by the charity

Sleep Scotland,aims to teach pupils tips,such as the importance of a bedtime routine and avoiding

late-night television.

[2]Experts say teenagers who seem bad-tempered could actually lack sleep because they go to bed

after midnight.The advice for pupils is that they should sleep for more than nine hours a night.Researchers

found that after going to bed after midnight,teenagers still _____________for watching television or

browsing the Internet.Some pupils were getting as little as four or five hours of sleep a night.

[3]One of the schools taking part in the project is Bellahouston Academy in Glasgow.Fiona Patterson,

head of the school's Health and Well-being Department,said the survey results were absolutely shocking.

"They can't function on so little sleep," she said.

[4]Sleep Scotland says getting enough sleep helps with academic performance and sporting skills.

However,going without enough sleep can be linked to obesity (肥胖) and a greater risk of depression.

Jane Ansell,director of Sleep Scotland,said,"You wouldn't send somebody to school without having the

right amount of food,so why would you send them without enough sleep?"

[5]A spokesman for Glasgow City Council said,"We are determined to provide guidance for young

people,so they can get the right amount of sleep and make the best of their learning potential."

1.What's the text mainly about? (Please answer within 10 words)

_________________________________________________________________________

2.Which sentence in the text is the closest in meaning to the following one?

People who lack sleep can easily gain weight and feel depressed,though.

_________________________________________________________________________

3.Fill in the blank in Paragraph 2 with proper words.(Please answer within 6 words)

__________________________________________________________________________

4.What are the benefits of getting enough sleep? (Please answer within 10 words)

__________________________________________________________________________

5.Translate the underlined sentence in Paragraph 5 into Chinese.

____________________________________________________________________

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人体最坚硬的部分是:()

A、指甲

B、牙齿

C、颅骨

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《中华人民共和国消防法》规定,教育、人力资源行政主管部门和学校、有关职业培训机构应当将消防知识纳入( )的内容。

A.考试 、考核、培训

B.考核 、教学、管理

C.教育、教学、培训

题型:问答题 简答题

电视频道Z-13的频率范围应该属于电磁波的()频段

A.VHFI

B.VHFII

C.VHFIII

D.UHF

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