首页
登录
职称英语
By the mid-nineteenth century, the term "icebox" had entered the American l
By the mid-nineteenth century, the term "icebox" had entered the American l
游客
2024-06-02
36
管理
问题
By the mid-nineteenth century, the term "icebox" had entered the American language, but ice was still only beginning to affect the diet of ordinary citizens in the United States. The ice trade grew with the growth of cities. Ice was used in hotels, taverns (酒馆), and hospitals, and by some forward-looking city dealers in fresh moat, fresh fish, and butter. After the Civil War( 1861-1865 ), as ice was used to refrigerate freight cars, it also came into household use. Even before 1880, half of the ice sold in New York, Philadelphia, and Baltimore, and one-third of that sold in Boston and Chicago, went to families for their own use. This had become possible because a new household convenience, the icebox, a precursor of the modem fridge, had been invented.
Making an efficient icebox was not as easy as we might now suppose. In the early nineteenth century, the knowledge of the physics of heat, which was essential to a science of refrigeration, was rudimentary (未发展的). The commonsense notion that the best icebox was one that prevented the ice from melting was of course mistaken, for it was the melting of the ice that performed the cooling. Nevertheless, early efforts to economize ice included wrapping up the ice in blankets, which kept the ice from doing its job. Not until near the end of the nineteenth century did inventors achieve the delicate balance of insulation and circulation needed for an efficient icebox.
But as early as 1803, and ingenious Maryland farmer, Thomas Moore, had been on the right track. He owned a farm about twenty miles outside the city of Washington, for which the village of Georgetown was the market center. When he used an icebox of his own design to transport his butter to market, he found that customers would pass up the rapidly melting stuff in the tubs of his competitors to pay a premium price for his butter, still fresh and hard in neat, one-pound bricks. One advantage of his icebox, Moore explained, was that farmers would no longer travel to travel to market at night in order to keep their produce cool. [br] What was essential to a science of refrigeration according to the passage?
选项
答案
Knowledge of the physics of heat.
解析
由题干关键词a science of refrigeration 定位到原文第二段第二句话,...the knowledge of the physics of heat, which was essential to a science of refrigeration直接给出了问题的答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3616183.html
相关试题推荐
IfyouhadtosumuptheproblemsofAmericanhealthcarintwowords,they
IfyouhadtosumuptheproblemsofAmericanhealthcarintwowords,they
IfyouhadtosumuptheproblemsofAmericanhealthcarintwowords,they
IfyouhadtosumuptheproblemsofAmericanhealthcarintwowords,they
IfyouhadtosumuptheproblemsofAmericanhealthcarintwowords,they
[originaltext]TwonewAmericanstudiesareaddingtoourunderstandingofw
[originaltext]TwonewAmericanstudiesareaddingtoourunderstandingofw
ManyAmericanslookattheeyesofthepeopletheyaretalkingwith,___________
ACross-CulturalContext:Americans,Germans,andEnglish
ACross-CulturalContext:Americans,Germans,andEnglish
随机试题
THERISEOFMOSCOW(1)Therise
杭州最出名的景点就是西湖(WestLake)。西湖是人工开凿的。杭州的西湖风景区在城市的西南部,占地60平方公里,其中西湖本身占地5.6平方公里。它最
HowtoApproachaDissertationI.Whatisadissertation
Inthesentence"Iraisedmyvoicetomakemyselfheard",theitalicizedphrase
下列关于大数据的分析理念的说法中,错误的是()。A.在数据基础上倾向于全体数据
以下方剂,常用于治疗久泻久痢的是:A.化食丸 B.化积丸 C.肥儿丸 D.
患者男性,26岁。在树丛行走时被蛇咬伤后,局部皮肤留下一对大而深的齿痕,伤口出血
某大型石油化工生产企业,原油加工能力1500万m3/年。厂区外设有原油储罐
1991-103.绛舌主 A.热盛B.瘀血C.两者均有D.两者均无
铁路营业线桥涵顶进施工常用的防护加固方法主要有()。A.扣轨法 B.吊
最新回复
(
0
)