首页
登录
职称英语
What is the passage mainly about? [br] [originaltext] Many people tend to
What is the passage mainly about? [br] [originaltext] Many people tend to
游客
2023-11-22
11
管理
问题
What is the passage mainly about? [br]
Many people tend to disregard the exhaust system of an automobile. They may think that the exhaust system does nothing more than to discharge the waste products of the combustion process. Although this is exactly what the exhaust system does, the way these waste product is discharged out of the engine is essential to the performance of the engine. A gasoline engine involves three processes: combustion, mechanical drive and exhaust. If one of these processes is impeded, the condition of the engine will depreciate. The exhaust system has three major functions, the first of which is to channel out the waste products of combustion out of the engine to allow it to continue to burn fuel unhindered thereby ensuring that the engine runs smoothly. An efficient exhaust system allows the waste gas and compound to escape quickly out of the system. If these waste products do not escape from the engine immediately, they may choke up the engine thus causing it to break down. Another function of the exhaust system is to reduce the noise generated by the engine. The third function of the exhaust system is to clean up the emissions that are harmful to the environment. When the engine burns fuel, it produces gases that pollute the air such as hydrocarbons, carbon monoxide and nitrogen oxides.
选项
A、It regulates the speed of a car.
B、It channels out the waste products of combustion.
C、It reduces the noises generated by the engine.
D、It cleans up the emissions harmful to the environment.
答案
A
解析
转载请注明原文地址:https://www.tihaiku.com/zcyy/3208336.html
相关试题推荐
Thenewsismainlyabout_______.[originaltext]TheIndiangovernmentsaysthe
Accordingtothenews,theChinesespokesman______.[br][originaltext]ACh
WhywastheUnitedStatescalleda"meltingpot"?[br][originaltext]TheUni
WhywastheUnitedStatescalleda"meltingpot"?[originaltext]TheUnitedSt
Whatisnotoneofthegirl’sdreams?[br][originaltext]M:Doyouhaveanydr
Whatisnotoneofthegirl’sdreams?[originaltext]M:Doyouhaveanydreamth
______membersofGreenpeacehadbeenaccused.[originaltext]Thecaptainoft
LuisPosadaCarrileswasdetained______[originaltext]Undergrowinginternati
Theterm"mummy"wasusedtodescribe______.[br][originaltext]Theancient
Theterm"mummy"wasusedtodescribe______.[originaltext]TheancientEgypt
随机试题
【B1】[br]【B4】[audioFiles]audio_eufm_j50_007(20082)[/audioFiles]participate
Malelionsaxeratherreservedaboutexpendingtheirenergyinhunting.More
AlthoughAprildidnotbringusthe【S1】______weallhopedfor,andalthough
一位华侨回国旅游时不慎丢失护照,导游人员协助其补办证件。以下做法正确的是()。A
反映公司短期偿债能力的指标有()。 Ⅰ.流动比率 Ⅱ.现金比率 Ⅲ.速
根据期权定价理论,期权价值主要取决于() Ⅰ.期权期限 Ⅱ.执行价格 Ⅲ
下列对于化疗药物不良反应的描述不正确的是A.阿霉素可引起骨髓抑制,心脏损害 B
根据我国现行宪法和法律,下列哪些人可以具有中国国籍() A.张某出生在中国澳
根据劳动合同法律制度的规定,下列关于用人单位向劳动者支付劳动报酬的表述中,正确的
一般情况下,水平位移监测采用()。A.交会法 B.三角高程法 C.水准
最新回复
(
0
)