首页
登录
职称英语
Petroleum products,such as gasoline,kerosine,home heating oil,residual fuel
Petroleum products,such as gasoline,kerosine,home heating oil,residual fuel
游客
2025-04-09
20
管理
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 compounds 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. [br] Many thousands of hydrocarbon compounds are possible because_____.
选项
A、the petroleum products vary greatly in physical appearance
B、complicated refining processes rearrange the chemical structure
C、the two atoms in the molecule assume many positions
D、the pressure needed to force it to the surface causes molecular transformation
答案
C
解析
文章第三段解释了碳和氢结合能形成数千种化合物的原因是“the various positions and joinings ofthese two atoms in the hydrocarbon molecule”,选项C符合文意。
转载请注明原文地址:https://tihaiku.com/zcyy/4033614.html
相关试题推荐
Thenewrangeofproducts______lastautumnisalreadysellingfarbetterthanis
Togiveyouageneralideaofourproducts,weenclosethecataloguesshowingva
Petroleumproducts,suchasgasoline,kerosine,homeheatingoil,residualfuel
Petroleumproducts,suchasgasoline,kerosine,homeheatingoil,residualfuel
Petroleumproducts,suchasgasoline,kerosine,homeheatingoil,residualfuel
Exportofhandicraftproductsisthemainstayofthecounty’seconomy.A、richres
Thebasicstructuralreasonforthisproblemisthatinformationproductsarech
Thebasicstructuralreasonforthisproblemisthatinformationproductsarech
Thegoalistousecrops,weedsandevenanimalwaste______thepetroleumthatfu
Thestoredisplayeditsmost______productsinthefrontwindow.A、modelB、present
随机试题
Whilebuildingahighwayacrossthedesert,______.A、anundergroundtownwasdis
Questions27-33ReadingPassage3hassevenparagraphsA-G.Fromthelistofhea
锅炉与墙壁之间至少留有()的间距。A.20cm B.30cm C.50
下列哪些是影响血液粘度的因素()A.温度 B.血浆粘度 C.红细胞比容
从所给的四个选项中,选择最合适的一个填入问号处,使之呈现一定的规律性:
对于被假释的罪犯,在假释考验期限内,由( )予以监督。A.检察机关 B.公
下列各项账簿,应由出纳人员登记的有()。A.库存现金日记账 B.银行存款日记
某220kV变电站内的消防水泵房与油浸式电容器相邻,两建筑物为砖混结构,屋檐为非
特殊建设工程消防验收中,由建设单位组织填写"消防验收申请表”,向消防设计审查验收
37岁经产妇,阴道足月顺产后第一天,主诉下腹疼痛难忍。查有低热、出汗、咽部无充血
最新回复
(
0
)