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
外语
An antifreeze is a liquid that is added to water to keep it from freezing. When water freezes and becomes into ice, it expands.
An antifreeze is a liquid that is added to water to keep it from freezing. When water freezes and becomes into ice, it expands.
admin
2009-05-15
58
问题
An antifreeze is a liquid that is added to water to keep it from freezing. When water freezes and becomes into ice, it expands. The force of water of expanding is so great that it can break the hardest metal. Water is used in car engines to keep them cool while they run, and if this water is allowed to freeze in winter it can break the iron block of the engine. That is why antifreezes are necessary.
Water freeze at zero centigrade; the usual kind of antifreeze will not freeze until the temperature is 40℃ below zero. A mixture of five parts of water and four parts of antifreezes will prevent freezing at 18℃ below zero; four parts of water and five parts of antifreeze reduce this to 22℃ below zero.
Alcohol is a good antifreeze, but when the car is running it turns hot and the alcohol bums away, so it must be replaced very often. Most persons use antifreezes that do not boil away when the engine is running. There are many chemicals that do this. One of the most popular is called ethylene glycol, which is sold under various trade names such as Preston and Xerox.
选项
A、to help to sell antifreezes
B、to explain what antifreezes are
C、to compare ethylene glycol with alcohol
D、to tell what kind of antifreeze to choose
答案
B
解析
从整篇文章看出,都是在讲防冻剂的概念、用途、使用方法及其使用它的必要性。故本题答案为B。
转载请注明原文地址:https://kaotiyun.com/show/Y1yd777K
本试题收录于:
公共英语二级笔试题库公共英语(PETS)分类
0
公共英语二级笔试
公共英语(PETS)
相关试题推荐
Whyisthewomansohappy?Whatadvicedoesthemangivethewoman?
题目1:口试老师:CandidateB,youwanttogototheNationalLibrary,butyouknowlittleaboutit.AskCandidateAtotellyou.Uset
ThefirststatedaimofU.N.was______.Amembercountrycannotally(结盟)itselfwith______.
SuchAccidentsAreRatherCommonWeallhave【B1】dayswheneverything【B2】wrong.Adaymaybeginwellenough,butsuddenly
Whichcountrydidthewomanvisit?
Themantriedhisbesttosatisfyhisdaughterwitheverythingbecause______.______,soBettystoppedtobeaservant.
Whathascausedthepollutionproblem?Itbecomesclearfromthetextthatthedrivingforce(动力)behindgreenproductsis______
Youworkfrom9:00amto4:30pmeveryday.Whichschoolswillyouchoose?YouwillprobablyprefertogototheInternational
—MycousinsentmeawonderfulgirlfromAfrica.—Oh,isthatso?______?
Tokeep______,wemustdomoreoutdoorexercises.
随机试题
女,49岁。劳累时心悸、气短3年,腹胀、尿少3天。心电图示心房颤动,心室率105次/分。胸部X线示心胸比值65%,肺淤血。有助于该患者诊断的辅助检查是()
对于处理含硫天然气,离心式分离器在排污时应()。
简述公共政策间接主体系统的基本功能。
A.泻下力强B.泻下力缓C.偏于活血D.清上焦火热E.善止血
【2013年第4题】题26~30:某变电所设一台400kVA动力变压器,Ud%=4,二次侧单母线为电动机负荷供电,其中一台笼型电动机额定功率为P=132kW,额定电压380V,额定电流240A,额定转速1480r/m,cosφed=0.89,额定效率0.9
在国际贸易中,对于计算商品重量时如何计算商品包装的重量有多种做法,包括下列()。
考迪罗主义
Ifthenationalpastimecouldbeintegrated,itseemedonlyamatteroftimebeforethenation’sschools,playgrounds,buses,andre
Manystudentsfindtheexperienceofattendinguniversitylecturestobeaconfusingandfrustratingexperience.Thelecturersp
说明:请以中国学生张锦秋(女)的身份填写下列表格。具体信息如下:出生年月:1982年10月16日联系地址:燕京市虹桥路496号电话:010—67289879个人详细情况:本人目前学历,学习英语的目的和经历,我的英语强项和弱项,希望在哪方面加强
最新回复
(
0
)