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
17
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/2999917.html
相关试题推荐
_______________(父母亲都觉得我不会被录用。“你要有后台才行”)"It’sanAmericanthing,RockefellerFou
UnitedStatesgovernment,andtheAmericanpeople.Itshistory,andthehist
UnitedStatesgovernment,andtheAmericanpeople.Itshistory,andthehist
UnitedStatesgovernment,andtheAmericanpeople.Itshistory,andthehist
UnitedStatesgovernment,andtheAmericanpeople.Itshistory,andthehist
Oursleeptimeoverthepastcenturyhasbeen【B1】______byalmost20percent
Oursleeptimeoverthepastcenturyhasbeen【B1】______byalmost20percent
Oursleeptimeoverthepastcenturyhasbeen【B1】______byalmost20percent
Oursleeptimeoverthepastcenturyhasbeen【B1】______byalmost20percent
Oursleeptimeoverthepastcenturyhasbeen【B1】______byalmost20percent
随机试题
WhenauthenticfiguresontheChineseandworldoilmarketsin2005finally
Employerswhoestablishretirementplansmustbe______aboutengagingintransa
Whichofthefollowingitalicizedpartsindicatesarelationshipoflinkingverb
Eachartistknowsinhisheartthatheissayingsomethingtothepublic.He
患者腰膝酸软,耳鸣,身体浮肿,腰以下尤甚,按之没指,小便短少,畏冷肢凉,腹部胀满
每面墙不宜有两列(行)以上非整砖,非整砖宽度不宜小于整砖的()。A、1/2 B
局部麻醉作用最强,主要用于表面麻醉的药物是A.丁卡因 B.普鲁卡因 C.苯妥
因违法行为或者违纪行为被解除职务的期货交易所、证券交易所、证券登记结算机构的负责
下列不属于摩擦性失业的是()。A.小李试图寻找更好的工作而离开原工作岗位
在用塑料排水板进行软土处理施工工艺程序中,“塑料排水板穿靴”之后应进行( )。A
最新回复
(
0
)