首页
登录
职称英语
Petroleum products, such as gasoline, kerosene, home heating oil, residual f
Petroleum products, such as gasoline, kerosene, home heating oil, residual f
游客
2024-02-19
19
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【S1】______, 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【S2】______. Sometimes crude oil is secured by drilling a hole through the earth, but more dry holes are drilled than those producing oils. Pressure at the source or pumping【S3】______crude oil to the surface.
Crude oil wells flow at varying rate, from ten to thousands of barrel per hour. Petroleum【S4】______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【S5】______of only two elements: carbon and hydrogen, which form compounds called hydrocarbons. Other chemical elements【S6】______in union with the hydrocarbons are few and reclassified as impurities. Trace elements are also found, but these are of such minute quantities that they are disregarded. The【S7】______of carbon and hydrogen forms many thousands of compounds which are possible because of the various positions and joining of these two atoms in the hydrocarbon molecule.
The various petroleum products are【S8】______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【S9】______or residual fuel oil and is used mostly for burning under boilers. Additional complicated refining processes rearrange the chemical structure of the hydrocarbon to produce other products, some of which are used to【S10】______and increase the octane rating of various types of gasoline.
A) degrade B) refined C) up D) light
E) products F) into G) surface H) heavy
I) forces J) combination K) exterior L) found
M) upgrade N) made O) interior [br] 【S10】
选项
答案
M
解析
根据句子结构,此处应填一与increase构成并列的动词原形,只有upgrade最符合题意。本句意为:额外的复杂精炼过程重新组合了碳氢化合物的化学结构用以生产其他的产品,一些产品用来升级或增加各种汽油的辛烷效率。
转载请注明原文地址:https://tihaiku.com/zcyy/3464921.html
相关试题推荐
Theheatingsystemhasrecentlybeen______tomakeitmoreefficient.A、modified
Thesteadyriseinthequalityofourproducts______theimprovementofourequ
A、Sheworksatthemeatcounter.B、Shearrangesproductsinneatpilesonthesh
A、Bemorecarefulaboutwhattheyadvertise.B、Advertisemorefortheirproducts
Theyoungwomanstilldenies______(在考试中作弊).cheatinginexamination/thatshech
Petroleumproducts,suchasgasoline,kerosene,homeheatingoil,residualf
Petroleumproducts,suchasgasoline,kerosene,homeheatingoil,residualf
Petroleumproducts,suchasgasoline,kerosene,homeheatingoil,residualf
Petroleumproducts,suchasgasoline,kerosene,homeheatingoil,residualf
Todaypetroleumprovidesaround40%oftheworld’senergyneeds,mostlyfuel
随机试题
Guesstheanswertotheriddle.There’sawordthat’scomposedofthreelet
Toacomparativeeducationalistmanyquestionsabouttheselectionandtrai
[originaltext]I’msureyourealizethatyourresearchpapersaredueinsi
固定资产更新决策属于()。A.直接投资决策 B.项目投资决策 C.间接
20岁,有性生活史,以往月经规律,停经3个月。妇科检查时发现子宫增大如孕4~5个
行政诉讼的受案范围决定的范围不包括()。A.司法机关对行政主体行为的监督范围
A.去皮壳B.去毛C.去心D.去核E.去瓤乌梅净制应除去的非药用部位是
调整和改革课程体系、结构、内容,建立新的基础教育课程体系,试行国家课程、地方课程
从“政府统一领导、部门依法监督、单位全面负责、公民积极参与”可以看出,政府、部门
根据《房屋建筑与装饰工程工程量计算规范》(GB50854-2013),关于金属结
最新回复
(
0
)