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
17
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
[originaltext]W:IunderstandyouaretakingtheAmericanliteratureseminarth
Withincreasingawarenessoftheenvironment,peoplehaverealizedthattheway
【B1】[br]【B9】[audioFiles]audio_eufm_j61_007(20082)[/audioFiles]ifhehasjust
血浆凝血酶原(PT)时间缩短见于A.血小板减少症、血小板无力症 B.血友病A
D
如果在网络的入口处通过设置ACL封锁了TCP和UDP端口21、23
2012年,某省规模以上工业增加值10875亿元,比上年增长7.1%,月度增速从
(2021年真题)下列活动中,属于自然过程的是()A.将锻件放在普通空气中冷却
(2008年真题)在国民经济核算中,按收入法计算,GDP的组成部分包括( )。A
按主蒸汽压力的大小,发电站汽轮机可以划分为()A.高压汽轮机 B.超高压汽轮
最新回复
(
0
)