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
51
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
Women’smindsworkdifferentlyfrommen’s.Atleast,thatiswhatmostmenareconvincedof.Psychologistsviewthesubjecteith
PassageThreeWhytheauthordidn’texaminethereliabilityofJin?
(1)IwasinmythirdyearofteachingcreativewritingatRalphMcKeeVocationalSchoolinStatenIsland,NewYork,whenoneof
Animalsarelivingcreaturesandmostofusoftenforgetaboutit.Althoughtheycan’tspeakourlanguage,theycanunderstandu
Whales,severalspeciesofwhichfaceextinction,havebecomesubjectsofconsiderablesympathy.Thesearetherecordedvoiceso
Whales,severalspeciesofwhichfaceextinction,havebecomesubjectsofconsiderablesympathy.Thesearetherecordedvoiceso
AnewstudyfromtheUniversityofNewSouthWaleshasdiscoveredthatduringtheworkingweek,Australianfathersonlyspendan
Allthecharactersinthestoryare________andcannotbefoundinreallife.
PassageThreeHowdothegroup’ssharedexperienceshelpthem?
Afterthewar,heworkedonanislandinthePacific,helpingthenativesandmedical________understandeachother’sbehavioran
随机试题
混凝土和易性包括()指标。
“青,取之于蓝,而青于蓝”出自()
建立全科医疗试点应考虑以下哪些因素
主要的牙髓病的致病因素是
关于行政主体概念的叙述错误的是()。
温度为300K,体积为2×10-3m3的一摩尔氧气,当它作绝热膨胀至体积为20×10-3m3的过程中对外做的功为()。
下列情形中,当事人主张诉讼时效抗辩,能够得到人民法院支持的是()。
案例: 2018年6月18日,甲向乙银行借款100万元,借期一年。同时,甲以其市价100万元的挖掘机作抵押,并约定:借款到期,若甲不能偿还借款本息,挖掘机直接归乙银行所有。双方签订了书面抵押合同,但未办理抵押登记。 7月17日,甲将挖掘机出租给丙,双方
已知f(x)在[a,b](0<a<b)上连续,在(a,b)内可导,且f(a)=f(b)=0.证明至少存在一点ξ∈(a,b),使得ξf′(ξ)一2f(ξ)=0成立.
HowDoYouSeeDiversity?A)Asamanager,Tiffanyisresponsibleforinterviewingapplicantsforsomeofthepositionswith
最新回复
(
0
)