在“乙醇、金刚石、稀有气体、二氧化锰、二氧化碳”中选用适当的物质填空. (1)可

题型:填空题

问题:

在“乙醇、金刚石、稀有气体、二氧化锰、二氧化碳”中选用适当的物质填空.

(1)可充入灯泡作保护气的是______;(2)可用作燃料的是______;

(3)可导致温室效应的是______;(4)可制作玻璃刀的是______.

(5)可用作实验室制氧气的催化剂的是______.

考点:化学研究的对象空气的成分催化剂和催化作用燃料的利用和新能源的开发二氧化碳对环境的影响
题型:填空题

With the spread of inter-active electronic media a man alone in his own home will never have been so well placed to fill the inexplicable mental space between cradle and crematorium. So I suspect that books will be pushed more and more into those moments of travel or difficult defecation (1) people still don’t quite know what to do with.

When people do read, I think they’ll want to feel they are reading literature, or (2) something serious. (3) you’re going to find fewer books presenting themselves as no- nonsense and (4) assuming literary pretensions and being packaged as works of art. We can expect an extraordinary variety of genre, but with an underlying (5) of sentiment and vision.

Translators can only (6) from this desire for the presumably sophisticated. We can look forward to lots of difficult names and fantastic stories of foreign parts enthusiastically (7) by the overall worship of the "global village" Much of this will be awful and some wonderful, (8) don’t expect the press or the organizers of prizes to offer you much help in making the appropriate distinctions. They will be chiefly (9) in creating celebrity, the greatest enemy of discrimination, but a good prop for the (10) consumer.

Every ethnic grouping over the world will have to be seen to have a great writer--a phenomenon that will (11) a new kind of provincialism, more chronological than geographic, (12) only the strictly contemporary is talked about and (13) . Universities, including Cambridge, will include (14) their literature syllabus novels written only last year. (15) occasional exhumation for the Nobel, the achievements of ten or only five years ago will be largely forgotten.

In short, you can’t go too far wrong when predicting more of the same. But there is a (16) side to this--the inevitable reaction against it. The practical things I would like to see happen--publishers seeking less to (17) celebrity through extravagant advertising, (18) and magazines (19) space to reflective pieces--are rather more improbable than the Second Coming (耶稣复临). But dullness never quite darkens the whole planet. In their own idiosyncratic fashion a few writers will (20) be looking for new departures.

4()

A.fewer

B.more

C.less

D.much

题型:填空题

组合图形是由若干个简单图形组合而成的,可以采用分解成简单图形,求面积之和的方法来求组合图形的面积。[ ]

题型:填空题

地下工程卷材防水层经检查合格后,应及时做保护层,保护层应符合哪些规定

题型:填空题

安装旋涡流量计或涡轮流量计时,应在流量计后()D处安装压力表(D为直径)。

A、1

B、2

C、3

D、4

题型:填空题

党的十七大指出,要加快形成统一开放竞争有序的现代市场体系。经济学中三个主要市场是( )

A.股票市场、产品市场和劳动力市场

B.劳动力市场、资本市场和外汇市场

C.产品市场、劳动力市场和资本市场

D.劳动力市场、外汇市场和股票市场

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