首页
登录
职称英语
Centuries ago, man discovered that removing moisture from food helps to pre
Centuries ago, man discovered that removing moisture from food helps to pre
游客
2024-10-03
19
管理
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. In this way the North American Indians produce pemmican (dried meat ground into powder and made into cakes), the Scandinavians make stockfish and the Arabs dried dates and "apricot leather".
All foods including water — cabbage and other leaf vegetables contains as much as 93% water, potatoes and other root vegetables 80%, lean meat 75% and fish, anything from 80% to 60%, depending on how fatty it is. If this water is removed, the activity of the bacteria which cause food to go bad is checked.
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 sulfur 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 of the fruit slightly and remove their wax coating, so as to increase 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 air 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 steel cylinder 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 axe 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 the 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. [br] The open-air method of drying food ______.
选项
A、is the one most commonly used today
B、was invented by the American Indians
C、has been known for hundreds of years
D、tends to be unhygienic
答案
C
解析
细节题。见第一段第一句话。几个世纪前,人们就发现出去食物中的水分有利于食物保鲜。
转载请注明原文地址:https://tihaiku.com/zcyy/3785107.html
相关试题推荐
Centuriesago,mandiscoveredthatremovingmoisturefromfoodhelpstopre
Centuriesago,mandiscoveredthatremovingmoisturefromfoodhelpstopre
Centuriesago,mandiscoveredthatremovingmoisturefromfoodhelpstopre
ButtheSwissdiscoveredlongyearsagothatconstantwarfarebroughtthem_____
Afterpeoplehavelearnedthatmagnetsattractthings,centuriespassed______t
Heplannedtostealthemoney,buthis______werediscovered.A、arrangementsB、b
Thiskindofmaterialcan______heatandmoisture.A、deleteB、compelC、constrain
AnewtypeoforganismdiscoveredinanArctictunnelcametolifeinthel
AnewtypeoforganismdiscoveredinanArctictunnelcametolifeinthel
Accordingtothenews,whofirstdiscoveredthefraud?[originaltext]Police
随机试题
TheComplexitiesofReadingThislectureisthefirs
A—NewYear’sDayB—Valentine’sDayC—LanternFestivalD—CarnivalE—Apr
高中信息技术《信息安全问题》主要教学过程及板书设计 教学过程 (一)导入 播放《碟中谍》的片段,并提出问题——片段中的伊森的伙伴在做什么?这样对不对?有什
败毒散中配伍少量人参的主要用意是()A.大补肺脾,以复正气 B.补脾益肺
A.对疑似精神病患者应进行详细的检查,防止误诊误治 B.精神病患者的病情不宜公
221、对长期微渗的互感器应重点开展()的检测,必要时可缩短检测时间,以掌握
遇有电气设备着火时,应立即将有关设备的(),然后进行救火。 A.保护停
一直流发电机端电压U1=230V,线路上的电流I=50A,输电线路每根导线的电阻
下列关于动脉粥样硬化叙述正确的是( )。A.主要累及小动脉 B.基本病变是动
人民法院使用普通程序审理的案件,应当在立案之日起()个月内审结完成。A.3 B
最新回复
(
0
)