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
Centuries ago, man discovered that removing moisture from food helps to preserve it, and that the easiest way to do this is to e
Centuries ago, man discovered that removing moisture from food helps to preserve it, and that the easiest way to do this is to e
admin
2011-01-05
34
问题
Centuries ago, man discovered that removing moisture from food helps to preserve it, and that the easiest way to do this is to expose the food to sun and wind.
Fruit is sun-dried in Asia Minor, Greece, Spain and other Mediterranean countries, and also in California, South Africa and Australia. The methods used vary, but in general, the fruit is spread out on trays in drying yards in the hot sun. In order to prevent darkening, pears, peaches and apricots are exposed to the fumes of burning sulphur before drying. Plums for making prunes, and certain varieties of grapes for making raisins and currants, are dipped in an alkaline solution in order to crack the skins the fruit slightly and remove their wax coating, so increasing the rate of drying.
Nowadays most foods are dried mechanically. The conventional method of such dehydration is to put food in chambers through which hot hair is blown at temperatures of about 110℃ at entry to about 43℃ at exit. This is the usual method for drying such things as vegetables, minced meat, and fish.
Liquids Such as milk, coffee, tea, soups and eggs may be dried by pouring them over a heated horizontal steel cylinder or by spraying them into a chamber through which a current of hot air passes. In the first case, the dried material is scraped off the roller as a thin film which is then broken up into small, though still relatively coarse flakes. In the second process it falls to the bottom of the chamber as a fine powder. Where recognizable pieces of meat and vegetables are required, as in soup, the ingredients are dried separately and then mixed.
Dried foods take up less room and weigh less than the same food packed in cans or frozen, and they do not need to be stored in special conditions. For these reasons they are invaluable to climbers, explorers and soldiers in battle, who have little storage space. They are also popular with housewives because it takes so little time to cook them. Usually it is just a case of replacing the dried-out moisture with boiling water.
Why are sulphur fumes used before drying some fruits?
选项
答案
To preserve their colors (To prevent darkening)
解析
转载请注明原文地址:https://jikaoti.com/ti/bHLMFFFM
本试题收录于:
C类竞赛(非英语专业本科)题库大学生英语竞赛(NECCS)分类
0
C类竞赛(非英语专业本科)
大学生英语竞赛(NECCS)
相关试题推荐
Twentyyearsago,atallyoungwomanwithashysmileflubbedherlinesbeforemillionsofpeopleandbecameasuperstar.OnJul
Thevenerable20-volumeOxfordEnglishDictionarycontainsabout700,000words,buttheeditorsrecentlyrealizedtheyweremiss
PassageTwoWhenshouldScoresbyhavebeendismissedfromschool,accordingtothenarrator?
DebateaboutproposalstoraisetheretirementageofChineseworkershasbeenraginginChinaforthepastfewyears.Thecompu
Signhasbecomeascientifichot【C1】________.Onlyinthepast20yearshavespecialistsinlanguagestudyrealizedthatsigned
(1)Whatwelearnedaboutourselvesanewthisweekwassomethingthat,intruth,weknewalready.Werediscoveredasimple,huma
TheGreatMistakeHaveyoueverreachedintherefrigeratorforyourfavouritesnackandfounditcoveredwithanasty-look
ThemanwatchesthevideobecauseitwasrequiredbyProfessorStephen.
ArecentsurveyofhumanresourcedirectorsintheUKuncoveredsomecommonmistakesthatjobapplicantsmakeintheinterviewp
Ifthebuildingproject______bytheendofthismonthisdelayed,theconstructioncompany______fined.
随机试题
下列关于拘传的说法中,错误的是:()
简述逮捕的条件。
关于妊娠期母体生殖系统的变化,以下叙述正确的是
某公司2010年年末有关资料如下:该公司资本来源包括2000万元、平均利率为8%的债务和普通股1000万股,每股面值3元。公司股东大会决定本年度按10%的比率计提法定公积金,本年按可供投资者分配利润的30%句普通股股东发放现金股利。该公司2011年初拟开发
下列有关货币的本质的说法错误的是()。
上市公司提取法定盈余公积达到注册资本的()时,可不再提取法定盈余公积。
XYZ会计师事务所接受委托负责对甲公司(系上市公司)2008年中期财务报表和2008年年度财务报表进行审计,并派遣A注册会计师实施具体审计工作。XYZ会计师事务所制定相应的质量控制政策和程序进行复核。
()是亚洲第一位诺贝尔文学奖获得者、诗人、小说家,诗集有《飞鸟集》《新月集》。
“东胡林人”遗址是新石器时代早期的人类文化遗址,在遗址中发现的人骨化石经鉴定属两个成年男性个体和一个少年女性个体。在少女遗骸的颈部位置有用小螺壳串制的项链,腕部佩戴有牛肋骨制成的骨镯。这说明在新石器时代早期,人类的审美意识已开始萌动。以下哪项如果为真,最能
博物馆响应上级要求,进行安全检测,需要身份证及其他证件,检查时间长,队伍排得也长,有些人因等待时间过长而焦躁不安,甚至情绪激动开始发牢骚。你是博物馆安检负责人,将如何处理此事?
最新回复
(
0
)