首页
登录
职称英语
Petroleum products, such as gasoline, kerosene, home heating oil, residual
Petroleum products, such as gasoline, kerosene, home heating oil, residual
游客
2023-11-19
30
管理
问题
Petroleum products, such as gasoline, kerosene, 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 hole through the earth, but more dry holes 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 42-gallon barrels.
Petroleum products vary greatly in physical appearance: thin, thick, transparent or opaque, but regardless, their chemical composition is made up of 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 quantifies 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 burning under boilers. Additional complicated terming processes rear~ range the chemical structure of the hydrocarbons to produce other products, some of which are used to upgrade and increase the octane 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
细节题。见第二段最后一句话“... because of the carious positions and joining of these two atoms...”。
转载请注明原文地址:https://tihaiku.com/zcyy/3199900.html
相关试题推荐
Hewascaught______intheexamination.A、deceivingB、cheatingC、trickingD、swin
Stepinsideourstoreforatwidevarietyofpersonalized______productsforbu
[audioFiles]audio_ezfm_0025(20103)[/audioFiles]Therearemanyproductsand
Petroleumproducts,suchasgasoline,kerosene,homeheatingoil,residual
Petroleumproducts,suchasgasoline,kerosene,homeheatingoil,residual
Fromthismaterialwecan______hundredsofwhatyoumaycalldirectproducts.A
Inthe1920sdemandforAmericanfarmproductsfell,asEuropeancountries
Cheatingisnothingnew.Buttoday,educatorsandadministratorsarefinding
Cheatingisnothingnew.Buttoday,educatorsandadministratorsarefinding
Cheatingisnothingnew.Buttoday,educatorsandadministratorsarefinding
随机试题
Thefatherwasthoroughlydishonestandtheson______him.Hehasalreadybeeni
不过,一个人到了四十岁后,在生活中大概都锻炼出宠辱不惊的本事,也不会在乎锦上添花、雪中送炭或落井下石了。那是因为我们已经历过生命的痛苦与挫折,也体验了许
TheGulfBetweenCollegeStudentsandLibrariansA)Student
Cricket,themosttypicalEnglishsport,hasbeen______sincethe16thcentury.A、
[originaltext]I’mhavingproblemslivingwithColin.We’vebarelyspokento
某甲施工单位通过施工投标方式与建设单位签订了某公路施工项目的施工合同。甲施工单位
苯巴比妥属于A.巴比妥类 B.氨基醚类 C.氨基甲酸酯类 D.苯二氮类
关于人民防空工程中,消防疏散照明的叙述正确的有()。A.人防工程的疏散走道、楼
2017年12月31日,甲被人打伤,但直到2018年4月30
下列关于砌体结构工程施工,说法正确的是()。A.当施工期间最高气温超过30℃时
最新回复
(
0
)