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
33
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
AccordingtoRyle,thetaskofphilosophyistorestate"______misleadingexpressions"informsthatarelogicallymoreaccurat
Americanshadalwaysbeenpreoccupiedwithreformingtheirsociety,with"makingitover,"andbetweenthe1890sandtheendof
Professionalarchivistsandlibrarianshavetheresourcestoduplicatematerialsinotherformatsandtheexpertisetoretrieve
ThereisextraordinaryexposureintheUnitedStatestotherisksofinjuryanddeathfrommotorvehicleaccidents.Morethan8
Giventhechoicebetweenspendinganeveningwithfriendsandtakingextratimeforhisschool-work,AndyKliseadmitshewould
Tosurviveintheintensetradecompetitionbetweencountries,wemust______thequalitiesandvarietiesofproductswemaketo
Avarietyofsimpletechniquescanpreventcomputercrime.Forexample,destroyingprintedinformation,protectingcomputerscre
Achildwhohasoncebeenpleasedwithatalelikes,asarule,tohaveitretoldinidenticallythesamewords,butthisshould
Don’trestonyourlaurels;______yoursuccessandstartlookingfornewmarketsnow.
随机试题
落在波士顿矩阵第Ⅲ象限的业务单元称为()
下列关于民事诉讼自认及其法律后果的说法,哪些是错误的?(2005年卷三第70题)
担心通货膨胀(物价上涨、货币贬值)进行购买的房产属于房地产需求者的()类型。
某实施监理的工程项目分为A、B两个单项工程,经有关部门批准采取公开招标的形式分别确定了三个中标人并签订了合同。A、B两个单项工程合同条款中有如下规定:A工程在施工图设计没有完成前,业主通过招标选择了一家总承包单位承包该工程的施工任务。由于设计工作
建设用地的补偿和安置包括( )。
我国国库管理制度改革的主要内容有()。
下列情形中,应当计算缴纳土地增值税的是()。
光电技术造就了电影艺术,有了电视,艺术家就抓住了机遇,创造了以电视剧为核心的电视艺术。这一次,艺术家当然也不会错过网络技术,已经有人涉足其中了,并构想了全新的网络艺术世界的蓝图。这段话的主要观点是:
设b>0,且=2,求b的值.
(2000年试题,一)微分方程xy’’+3y’=0的通解为_____________.
最新回复
(
0
)