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 oil, all come from one so
Petroleum products, such as gasoline, kerosine, home heating oil, residual fuel oil, and lubricating oil, all come from one so
admin
2011-01-21
74
问题
Petroleum products, such as gasoline, kerosine, home heating oil, residual fuel oil, and lubricating oil, all 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 hole through the earth, but more dry holes are drilled than those generating 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 are different in physical appearance: thin, thick, transparent or opaque, but 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 light oils, such as gasoline, kerosine, and distillate oil. The residue remaining after the light oils are distilled is named as heavy or residual fuel oil and is used mostly for burning under boilers. Additional complicated refining processes rearrange the chemical structure of the hydrocarbons to produce other products, some of which are used to upgrade and increase the octane rating of various kinds of gasoline.
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
由第三段最后一句中“...which are possible because of the various positions and joinings...”可知选项C正确。
转载请注明原文地址:https://kaotiyun.com/show/O63d777K
本试题收录于:
公共英语三级笔试题库公共英语(PETS)分类
0
公共英语三级笔试
公共英语(PETS)
相关试题推荐
InNewZealandChristmasDayitselfisobservedmuchthesamewayasitisintheUnitedStatesandEurope.(61)Therearesome
Onebasicweaknessinaconservationsystembasedwhollyoneconomicmotivesisthatmostmembersofthelandcommunityhaveno
9.5本题考查考生对于具体数字信息的听辨能力。原句为“…hopingthatbylearninghowthedisordertakesroot,theycanfindwaystokeepitfromgrowingintoa
Educationisprimarilytheresponsibilityofthestates.Stateconstitutionssetupcertainstandardsandrulesfortheestablis
Petroleumproducts,suchasgasoline,kerosine,homeheatingoil,residualfueloil,andlubricatingoil,allcomefromoneso
Howdidthewomandoonherdrivingtest?
Howdidthewomandoonherdrivingtest?
Howdidthewomandoonherdrivingtest?
Howdidthewomandoonherdrivingtest?
随机试题
变音
胆矾的功效
会计档案是指记录和反映经济业务事项的重要历史()。
下列各项中,属于资产要素特点的有()。
甲公司为增值税一般纳税人,适用的增值税税率为17%。2018年7月发生经济业务如下:(1)为公司员工垫付医药费10万元,以银行转账方式支付。(2)对生产车间设备进行大修理,发生材料费10万元,人工费15万元。(3)将自产的一批产品发给企业
人力资源管理中各种策略的培训内容不包括()。
曲线y=∫0xtantdt(0≤x≤)的弧长s=___________。
如下图所示,CiscoCatalyst6500的千兆以太网端口4/5与CiscoCatalyst3500的端口g0/8相连,g0/8工作在全双工方式。两台交换机之间需传输两个VLAN,其VLANID为101、102,VLAN名为VL101、VL1
要存放10个24×24点阵的汉字字模,需要的存储空间是
A、Hesoldhisinventiontomakemoney.B、Hepreferredinventiontoteaching.C、Hewashonoredwithanawardforhisteachingmet
最新回复
(
0
)