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
58
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://kaotiyun.com/show/n9VK777K
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
Ordinarilywepaylittleattentiontothewordswespeak.Weconcentrateinsteadonthemeaningweintendtoexpressandaresel
DebateaboutproposalstoraisetheretirementageofChineseworkershasbeenraginginChinaforthepastfewyears.Thecompu
Animalsarelivingcreaturesandmostofusoftenforgetaboutit.Althoughtheycan’tspeakourlanguage,theycanunderstandu
Whales,severalspeciesofwhichfaceextinction,havebecomesubjectsofconsiderablesympathy.Thesearetherecordedvoiceso
Iwasasecond-yearmedicalstudentattheuniversity,andwasonmyseconddayofroundsatanearbyhospital.Myuniversity’s
PASSAGEONEWhatofallthevaluesmentionedinthepassage,whichoneisregardedasthemostfundamental?
PASSAGETWOWhyisreceivingwatchesinthewrongcolorsaproblem?
AnewstudyfromtheUniversityofNewSouthWaleshasdiscoveredthatduringtheworkingweek,Australianfathersonlyspendan
Theconceptofpersonalchoiceinrelationtohealthbehaviorsisanimportantone.Anestimated90percentofallillnessesmay
Everybodymakeslanguagemistakes,whetheritisintheirownlanguageoraforeignlanguage.Sometimesinsteadofthewordthat
随机试题
学习者的概念属于“自我定向型”,属于【】
建设期融资费用包括项目建设期间发生的各类()
在WindowsXP中,可以实现全角与半角转换的操作是组合键()。
现阶段中国获得国际认可的文艺作品大多是乡村题材,几千年农业文明是创作的宝库,莫言和张艺谋本质上都是农民,他们擅长呈现让西方惊叹的东方乡村世界。而中国的当代城市题材还相当孱弱,什么时候有大量像村上春树那样描摹城市和现代人的文艺作品获得国际认可.我们的文艺才真
致力于发展学生道德判断能力的德育模式是()
公务员所在的机关可以根据情况增加或减少公务员的劳动报酬和保险、福利待遇。
细分市场的有效标志主要有()。
下列关于刑法中因果关系地位的表述中,正确的是()
Noonecanusecellphonesinanyareasatthehospitalwhereequipmentmightbeaffectedbytheinterferencefromcellphones.
A、Theplaywasthefirsthe’dseen.B、Theplaywasn’ttoobad.C、Hehasn’tseentheplayyet.D、Hewantstoseetheplayagain.
最新回复
(
0
)