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
By the mid-nineteenth century, the term "icebox" had entered the American language, but ice was still only beginning to affect t
By the mid-nineteenth century, the term "icebox" had entered the American language, but ice was still only beginning to affect t
admin
2010-09-25
32
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 meat, 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 modern 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 have to travel to market at night in order to keep their produce cool.
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://kaotiyun.com/show/Dyz7777K
0
大学英语六级
相关试题推荐
ThepeopleoftheUSAhavebeenopposedtoacentralizedgovernmentsincelongbeforetheRevolutionof1776.Whenthe13coloni
ThepeopleoftheUSAhavebeenopposedtoacentralizedgovernmentsincelongbeforetheRevolutionof1776.Whenthe13coloni
ThepeopleoftheUSAhavebeenopposedtoacentralizedgovernmentsincelongbeforetheRevolutionof1776.Whenthe13coloni
ThepeopleoftheUSAhavebeenopposedtoacentralizedgovernmentsincelongbeforetheRevolutionof1776.Whenthe13coloni
Emotionsaredefinedasstrong,relativelyuncontrolledfeelingsthataffectourbehavior.Everyoneexperiencesawiderangeof
Longbeforethefirst【B1】______arrivedinAmerican,astrangelookinganimallivedonthewestern【B2】______.Itlookedsomewha
Longbeforethefirst【B1】______arrivedinAmerican,astrangelookinganimallivedonthewestern【B2】______.Itlookedsomewha
Longbeforethefirst【B1】______arrivedinAmerican,astrangelookinganimallivedonthewestern【B2】______.Itlookedsomewha
Whenyoustarttalkingaboutgoodandhadmannersyouimmediatelystartmeetingdifficulties.Manypeoplejustcannotagreewhat
Martinbeggedhismothertopardonhim,______(保证以后考试不现作弊了).
随机试题
在E.coli的转录过程中δ因子识别在E.coli的转录过程中ρ因子识别
善治风湿热痹者善治下肢风寒湿痹者
男,60岁,因胃溃疡合并多次大出血,行胃大部切除术。该患者术后5天出现胃出血,最可能的原因是
背景某全现浇塔楼住宅工程,地下2层、地上28层,建筑面积17656m2。该工程项目周围为已建工程,因施工场地狭小,现场道路按3m考虑并兼作消防车道,路基夯实,上铺150mm厚砂石,并做混凝土面层。搅拌机棚、砂石料只能在与已建工程之间的间隙堆放。现场布置两
下列各项,不属于诉讼外调解特征的是( )。
自2006年9月15日起,取消出口退税的商品被列入加工贸易禁止类目录。下述商品中,新被列入加工贸易禁止类目录的是:
正保股份有限公司(本题下称“正保公司”)为增值税一般纳税人,适用的增值税税率为17%。正保公司以人民币作为记账本位币,外币业务采用交易发生日的即期汇率折算,按月计算汇兑损益。(1)正保公司有关外币账户2008年3月31日的余额如下:(2)正保公司
需要立卷归档的会议文件包括()。
()年联合国第44届大会通过了《儿童权利公约》。
父母没有预料到孩子的问题是这样难回答。
最新回复
(
0
)