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
外语
Petroleum products,such as gasoline,kerosine,home heating oil,residual fuel oil,and lubricating oils, come from one source-crude
Petroleum products,such as gasoline,kerosine,home heating oil,residual fuel oil,and lubricating oils, come from one source-crude
admin
2012-05-18
32
问题
Petroleum products,such as gasoline,kerosine,home heating oil,residual fuel oil,and lubricating oils, come from one source-crude oil found below the earth’s surface,as well as under large bodies of water, from a few hundred feet below the surface to as deep as 25,000 feet into the earth’s interior. Sometimes crude oil is secured by drilling a bole through the earth,but more dry boles are drilled than those producing oil. Pressure at the source or pumping forces crude oil to the surface.
Crude oil wells flow at varying rates,from ten to thousands of barrels per hour. Petroleum products are always measured in 42-gallon barrels.
Petroleum products vary greatly in physical appearance:thin,thick,transparent or opaque,but regardless, their chemical composition is made up of only two elements:carbon and hydrogen,which form com-pounds called hydrocarbons. Other chemical elements found in union with the hydrocarbons are few and are classified as impurities. Trace elements are also found,but these are of such minute quantities that they are disregarded. The combination of carbon and hydrogen forms many thousands of compounds which are possible because of the various positions and joinings of these two atoms in the hydrocarbon molecule.
The various petroleum products are refined from the crude oil by heating and condensing the vapors. These products are the so-called light oils,such as gasoline,kerosene,and distillate oil. The residue remaining after the light oils are distilled is known as heavy or residual fuel oil and is used mostly for bunting under boilers. Additional complicated refining processes rearrange the chemical structure or the hydrocarbons to produce other products,some of which are used to upgrade and increase the octane (辛烷) rating of various types of gasoline.
Which of the following is TRUE?
选项
A、The various petroleum products are produced by filtration.
B、Heating and condensation produce the various products.
C、Chemical separation is used to produce the various products.
D、Mechanical means such as the centrifuge (离心机) are used to product the various products.
答案
B
解析
从第四段“The various petroleum products are refined from the crude oil by heating and condens ing the vapors.”可知答案为B项。
转载请注明原文地址:https://kaotiyun.com/show/BTnO777K
0
考博英语
相关试题推荐
Ifincomeistransferredfromrichpersonstopoorpersonstheproportioninwhichdifferentsortsofgoodsandservicesarepro
Thefoodwasdivided______accordingtotheageandsizeofthechild.
Strictsanitaryproceduresformulatedbyourmunicipalgovernmenthelpto______out-breaksofdiseases.
AtonetimetheDemocraticPartywasconsideredtobeapartystanding______staterights.
Inthesimplestterms,amarketistheplacewheresellermeetsbuyertoexchangeproductsformoney.Traditionalmarketsstill
Inthesimplestterms,amarketistheplacewheresellermeetsbuyertoexchangeproductsformoney.Traditionalmarketsstill
Computersmayonedayturnnightintoday-withgoodold,naturalsunlight.Giantcomputer-controlledmirrors,thousandsoff
"Thecarranoutofgas!""That______thecause.Ifilledthetankthismorning."
Achildwhohasoncebeenpleasedwithatalelikes,asarule,tohaveitretoldinidenticallythesamewords,butthisshould
Theleaderoftheexpedition______everyonetofollowhisexample.
随机试题
真菌性阴道炎阴道分泌物外观呈
抗休克的最基本治疗措施是:
目前我国实行的工时制度主要有()。
小张去车站接一位陌生客人,他的预期会影响对这位客人的辨认。这种知觉的加工方式主要是()。(2008年)
Severalyearsintoacampaigntogetkidstoeatbetterandexercisemore,childobesityrateshaveappearedtostabilize,andm
下列给定程序中,函数fun的功能是:找出一个大于给定整数m且紧随m的素数,并作为函数值返回。请改正程序中的错误,使它能得出正确的结果。注意:部分源程序在文件MODI1.C中,不要改动main函数,不得增行或删行,也不得更改程序的结构!试题程序:#i
在某公司人力资源部就职的张晓鸣需要制作一份供新员工培训时使用的PowerPoint演示文稿。按照下列要求,并参考“完成效果.docx”文件中样例的效果,完成演示文稿的制作。在幻灯片2中插入考生文件夹下的图片“欢迎图片.jpg”,并应用“棱台形椭圆,黑色
Lookatthelistbelow.Itshowssomeofthestandsatatradefair.Forquestions6-10,decidewhichisthemostsuitablesta
A、Thescandals.B、Thesports.C、Thecrosswordpuzzles.D、Themainstories.C
Literatureisameansbywhichweknowourselves.Byitwemeet【M1】______futureselves,andrecognizepastselves;agai
最新回复
(
0
)