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
2023-09-09
57
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] It can be inferred from the passage that the theoretical foundation of ice box should be that ______.
选项
答案
the melting of ice performed cooling
解析
题目询问冰盒的理论原理是什么。可以定位到文章第二段的第三句话,... for it was the melting of the ice that performed the cooling,此句大意说当时人们以为阻碍冰融化才能有效制冷,但实际上这是错误的观点,因为只有在冰的融化过程中才能有效制冷。可见冰盒的理论原理就是the melting of ice performed cooling。
转载请注明原文地址:https://tihaiku.com/zcyy/2999918.html
相关试题推荐
[originaltext]TheAmericanAcademyofPediatricsrecentlyadvisedparentst
[originaltext]TheAmericanAcademyofPediatricsrecentlyadvisedparentst
[originaltext]TheAmericanAcademyofPediatricsrecentlyadvisedparentst
Americansocietyisnotnap-friendly.Infact,saysDavidDinges,asleep【B1
Americansocietyisnotnap-friendly.Infact,saysDavidDinges,asleep【B1
Americansocietyisnotnap-friendly.Infact,saysDavidDinges,asleep【B1
Americansocietyisnotnap-friendly.Infact,saysDavidDinges,asleep【B1
Americansocietyisnotnap-friendly.Infact,saysDavidDinges,asleep【B1
[originaltext]Comparativelyspeaking,Americansgivegiftsonarelatively
MostAmericansspendfarmoreoftheirleisuretimewiththemassmediathan
随机试题
RaisingPets1.有些人喜欢养宠物,理由是……2.有些人反对养宠物,理由是……3.我的观点
联合国相关机构发布报告称,去年的新冠疫情对全球经济造成了“前所未有”的打击,全球损失了相当于2.25亿个全职工作岗位。【T1】新冠疫情导致全球工作时间
[originaltext]W:WhyisBobsoupset?M:He’sbeenstudyingdayandnightforh
艾滋病患者肺部机会性感染最常见的病原体是A.白色念珠菌 B.结核杆菌 C.疱
趋势线的确认条件包括()。 I.必须确实有趋势存在 II.标准趋势线必须由
简述现代企业人力资源管理各个历史发展阶段的特点。
刘某为甲期货公司从业人员,乙期货公司承诺给刘某较高的返佣后,刘某私下将新开发的客
适用于远中游离端缺失末端基牙,有应力中断作用的卡环是A.回力卡环B.圈形卡环C.
共用题干 患儿男,3岁。右颈上部无痛性肿块半年。体检见右颈上部胸锁乳突肌前及表
慢性粒细胞性白血病的Ph染色体是A.T(8;21) B.T(8;22) C.
最新回复
(
0
)