首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
专升本
Magnesium is another mineral we now obtain by collecting huge volumes of ocean water and treating it with chemicals. Although or
Magnesium is another mineral we now obtain by collecting huge volumes of ocean water and treating it with chemicals. Although or
admin
2011-04-26
79
问题
Magnesium is another mineral we now obtain by collecting huge volumes of ocean water and treating it with chemicals. Although originally it was derived only from brines or from the treatment of such magnesium-containing rocks as dolomite, of which whole mountain ranges are composed. In a cubic mile of sea water there are about four million tons of magnesium. Since the direct extraction method was developed about 1941, production has increased enormously. It was magnesium from sea that made possible the wartime growth of the aviation industry, for every, air plane made in the United States (and in most other countries as well) contains about haft a ton of magnesium metal. And it has innumerable uses in other industries where a lightweight metal is desired, besides its long-standing utility as an insulating material, and its use in printing inks, medicines, and toothpaste.
It can be inferred from the passage that during the past fifty years the demand for magnesium has
选项
A、declined greatly
B、remained stable
C、increased slightly
D、risen dramatically
答案
D
解析
转载请注明原文地址:https://www.kaotiyun.com/show/cgqC777K
本试题收录于:
英语题库成考专升本分类
0
英语
成考专升本
相关试题推荐
Mr.Smith’sconditionlooksseriousanditisdoubtfulifhewill______.
Insteadofresearchingandwritingtheirpapers,somestudents______.Outof300paperscheckedforfakes,______.
Before1914femalesecretarieswererarebecausethey______.Afemalesecretaryhasbeenexpected,besidesotherduties,to__
Ifapersonfindsgettingupearlyaproblem,mostprobably______Whichofthefollowingmayleadtofamilyquarrelsaccording
______today,hewouldgettherebyFriday.
(毕竟)thereareovertwentydifferentmeaningsfor"fast"inthedictionary.
Thetrafficwon’treturntonormaluntiltheworkersfinish______(wide)theroad.
Theengineerandworkerreferredto______todesignsomething.
Idon’tthinksheisright,soherwordsofadvicewere______onme.
Eggsaremyfavoritefood.Ilikethem【21】,hard-boiled,scrambled,orpoached.1eateggsfor【22】,lunch,anddinner.Ieategg
随机试题
A、TopindustrialcountriesmetintheUSforworldfinance.B、DevelopingeconomiesmetintheUSforasummitonfinance.C、G20
________是政策评估中占据主导地位的一种评估方式,其结论往往是政府和社会公众考察政策效果的主要依据。
高血压病的血管壁玻璃样变性发生于
根据《招标投标法》的规定,常用的评标方法分为()。
根据不同的标准可以对税法进行不同的分类。对税法所作的下列分类中,以税法功能作用的不同作为分类标准的是()。
财政政策原则,又称为公共收入原则。即国家征税的主要目的是组织公共收入,满足支出需要,所以收入的来源必须充分又有弹性。此原则又细分为()。
下列关于我国政府预算的说法中正确的是()。
企业促销策略包括()。
阅读案例,回答问题。师:丑小鸭伤心地离开了家,就是离家出走的意思,你们离家出走过吗?生(齐答):没有。师:所以你们体会不到丑小鸭的伤心。现在我们一起来朗读课文第四到第六自然段。谁来说说丑小鸭后来怎么了?(师随后指名回答,生1、生2都答不上来。师表情严
根据2018年国务院政府工作报告,下列有关我国过去五年来所取得的成就说法不正确的是:
最新回复
(
0
)