热工仪表检修、校验周期、校验条件有何规定?

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问题:

热工仪表检修、校验周期、校验条件有何规定?

考点:热工应知应会热工仪表、热工计量热工仪表、热工计量题库
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在制定保险规划时,高薪阶层考虑的重点不包括( )。

A.为应对疾病风险和医疗费用,必须购买足够的健康保险和医疗保险

B.保障期长,能够应付养老问题的险种应该尽早考虑,如养老保险、终身寿险

C.由于这个收入阶层的一家之主是家庭的主要经济来源,应该为其投保健康险

D.可以考虑购买一定的投资连结型产品,在确保保障的同时,享受保险公司专业、稳健经营的成果

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标准螺纹包括()螺纹。

A.普通 

B.管螺纹 

C.梯形 

D.锯齿形 

E.蜗杆

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本文介绍了美国著名的生物学家Edward Wilson 的著作The Future of Life中的一些有关如何开发、利用和保护自然资源的情况。

Edward Wilson is America’s, if not the world’s, leading naturalist. In The Future of Life, he takes us on a tour of the world’s natural resources(资源). How are they used? What has been lost? What remains and is it able to continue with the present speed of use? Wilson also points out the need to understand fully the biodiversity(生物多样性)of our earth.

Wilson begins with an open letter to the pioneer in environment (环境) protection, Henry David Thoreau. He compares today’s Walden Pond with that of Thoreau’s day. Wilson will use such comparisons for the rest of the book. The problem is clear: man has done great damage to his home over the years. Van the earth, with human help, be made to return to biodiversity levels that will be able to support us in the future?

Biodiversity, Wilson argues, is the key to settling many problems the earth faces today. Even our agricultural crops can gain advantages from it. A mere hundred species(物种) are the basis of our food supply, of which but twenty carry the load. Wilson suggests changing this situation by looking into ten thousand species that could be made use of, which will be a way to reduce the clearing of the natural homes of plants and animals to enlarge farming areas.

At the end of the book, Wilson discusses the importance of human values in considering the environment. If you are to continue to live on the earth, you may well read and act on the ideas in this book.

小题1: We learn from the text that Wilson cares most about ______

A.the environment for plants

B.the biodiversity of our earth

C.the wastes of natural resources

D.the importance of human values小题2:How many species are most important to our present food supply?

A.Twenty.

B.Eighty.

C.One hundred

D.Ten thousand.小题3:Wilson suggests that one way to keep biodiversity is to _______.

A.learn how to farm scientifically

B.build homes for some dying species

C.make it clear what to eat

D.use more species for food小题4: We can infer that the text is _______

A.a description of natural resources

B.a research report

C.a book review

D.an introduction to a scientist.

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气相色谱法测定海水中PCBs时,活性炭在使用前需经()℃烘4h,装具塞玻璃瓶中,置于干燥器保存。

A、200

B、280

C、360

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凡充于电气设备中的六氟化硫气体,均属于使用中的六氟化硫气体()

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