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
专升本
The first automobile was invented more than two hundred years ago. It used steam for power and had wooden wheels. The first auto
The first automobile was invented more than two hundred years ago. It used steam for power and had wooden wheels. The first auto
admin
2011-06-28
51
问题
The first automobile was invented more than two hundred years ago. It used steam for power and had wooden wheels. The first automobile may have been simple and primitive, but it was an extremely important invention. The automobile today is the primary means of land transportation. It has produced more changes in our daily life than any other machines.
Almost all gasoline engines work in the same way—with four movements, or strokes, of a piston in a cylinder. The first stroke pulls the fuel mixture (gasoline and air) into the cylinder. The second stroke compresses the fuel mixture. A spark plug produces a spark that ignites the fuel mixture and causes the third stroke. The final stroke removes any waste gases which might remain in the cylinder.
The preceding paragraph explains what happens inside the cylinder to make the piston move. When the piston is pushed down by the explosion in the third stroke, it pushes the connecting rod. This rod rotates the crankshaft. The crankshaft is connected to other parts which turn the wheels. Most cars today have four, six, or eight cylinders.
Spark plugs cause the fuel mixture to ______.
选项
A、compress
B、remove waste
C、burn
D、to enter the cylinder
答案
C
解析
本题属推理分析题。文章第二段中的倒数第二句中的:a spark plug ... that ignites the...已提示:它是个打火活塞。
转载请注明原文地址:https://kaotiyun.com/show/tTlC777K
本试题收录于:
英语题库成考专升本分类
0
英语
成考专升本
相关试题推荐
SimonHarperwritesfromtheviewpointofsomeonewho______.WhichofthefollowingisNOTanopinionexpressedbyMagdalenaS
Itwasfromtheearliesttime______menbegantostudythenaturalphenomenaandheavenlybodies.
BillyJoelbegantakingpianolessons______.Whichofthefollowingfactsisthelast?
Mary______allfoolishcommentsandkeptonworking.
Theauthor’spurposeinwritingthispassageistotell______.WhichofthefollowingisNOTtrueaccordingtothepassage?
Someanimalswillmodifytheirbehaviorto______theirenvironment.
Somepeoplethinktheyhaveananswertothetroublesofautomobilecrowdinganddirtyairinlargecities.Theiransweristhe
Ithoughtitwasworth______ahundredmilestoseethebasketballgame.
GeorgeBernardShaw,thegreatestBritishdramatist(居作家)ofthefirsthalfofthe20thcentury,wasborninDublin,Ireland.Hi
Yououghtn’ttohavebeenthere,______?
随机试题
A、血尿B、蛋白尿C、脓尿D、多尿E、少尿或无尿肾前性急性肾衰常见的原因是()
26岁,女性,近半年在左乳房外上象限扪及一直径3cm的圆形、光滑、活动、质韧之肿块,该肿块可能是
当呼吸系统的疾病发生于一个以上的部位并且没有明确的索引指明其编码时
脓肿的主要致病菌是
35周婴儿,出生体重1.5kg,生后3天体温不升,需置暖箱,该暖箱适宜的温度是
直线式项目监理组织形式具有()特点。
熔焊中受力比较理想的接头形式为()。
【背景资料】某机电安装公司承包了一造纸车间的机电安装工程,包括属于本车间的槽罐制作安装任务(含有两台碳钢压力容器)。合同规定除工艺设备外的所有材料均由施工单位采购,拖延工期要重罚,对于文明施工也提出了具体要求。由于工期特别紧张,业主要求土建基础交付安装后
下列叙述中,正确的是
Rabbitearantennasareoldfashionedbutarestillinuse.ATVcanhavepoorreceptionevenifitisnearthesignalsources.
最新回复
(
0
)