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
38
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
WhyisMrGriffingoingtothecitywherethehotelislocated?[br][originalt
Forthispart,youareallowed30minutestowriteanessayoninformationb
Agoodteachermustbe_________toostric
1型糖尿病的特点A.空腹低血糖B.空腹高血糖C.血糖水平正常D.血胰岛素水平正常
HbO解离曲线是S形的原因是A.Hb含有FeB.Hb含有血红素C.Hb属于变构蛋
白豆蔻与砂仁的共同功效是A.化湿 B.行气 C.温中 D.止呕
期货公司应当针对客户期货投资咨询具体服务需求()。A.揭示期货市场风险 B.揭
(2021年真题)患者,女,47岁,因慢性阻塞性肺疾病使用布地奈德福莫特罗粉吸入
副根管多见于A.切牙 B.尖牙 C.前磨牙 D.磨牙 E.多生牙
早期发现肺结核的最主要方法是A.询问病史 B.X线检查 C.痰菌检查 D.
最新回复
(
0
)