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
31
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.
According to the passage, magnesium was first obtained from ______.
选项
A、rocks found on land
B、great amounts of ocean water
C、the sea floor
D、major industrial sites
答案
A
解析
转载请注明原文地址:https://jikaoti.com/ti/924GFFFM
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
WhydidStanleyWilliamswriteanti-gangbooks?WhichofthefollowingwouldWilliamswanttobehislegacy?
Accordingtothepassage,cultureshock______.Accordingtothepassage,cultureshockresultsfrom______.
Therapiddevelopmentofcommunicationstechnologyistransformingthe______inwhichpeoplecommunicateacrosstimeandspace.
Patientsdonotoftenbelievetheyreallyneedsurgery,cuttingintoapartofthebody,treatmentwithdrugs.
Theseanimalsaremore______greencolour;theyalwaysmakeforthetagwithvariousshadesofgreen.
______wehavefinishedthecourse,weshallstartdoingmorerevisionwork.
Thisletterismostprobablywrittenby______.Inthepassage,thewords"greatadventure"mayreferto______.
ItwasaquarterpastnineasMariehurriedintotheofficebuildingwhereshewasgoingtowork.Herbusmovedslowlyalongthr
Uptonowscientistshavenotfoundhowto______patientsofthatdisease.
随机试题
国有资本控股公司、国有资本参股公司与关联方的交易,依照《公司法》和有关行政法规以及公司章程的规定,由公司股东会、股东大会或者董事会决定。下列说法不正确的是()。
龟板的功效为
生地、麦冬、玄参同用的方剂是()(1992年第145题)
Miles手术的适应证是()
人参健脾丸使用注意事项为
一般工业锅炉受热面的蒸发率为( )。
基金与股票的区别在于()。Ⅰ.反映的经济关系不同Ⅱ.筹集资金的投向不同Ⅲ.收益风险水平不同Ⅳ.投资数量不同
项目风险识别的方法和工具有很多,既有结构化方法也有非结构化方法,既有经验性方法也有系统性方法,在具体应用过程中要结合具体情况组合使用。请据此回答下面的问题:以下关于风险识别的说法中不正确的是________。
材料何老师班上的小龙,经常迟到、旷课,不完成作业,还欺负同学。在多次批评教育无效后,何老师决定到他家去一趟,向他父母告状。到小龙家时,何老师惊奇地发现他正在做家务,见到何老师,小龙吃了一惊,但还是喊了一声“老师好”后跑回房间。在同小龙父母交谈后,
读图的三角形坐标图,回答下列小题。如果a、b、c分别表示农业生产社会经济投入中的劳动力投入、生产资料投入、科技投入,下列各点中最能代表亚洲水稻种植业的是()。
最新回复
(
0
)