单项选择题
熵是系统混乱度的量度，一定量的某物质的熵随着温度升高而增大。
A、正确
B、错误
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相关考题
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未知题型
Amtrak(美国铁路客运公司) was experiencing a downswing in ridership(客运量) along the lines comprising its rail system. Of major concern to Amtrak and its advertising agency DDB Needham, were the long-distance western routes where ridership had been declining significantly.At one time, trains were the only practical way to cross the vast areas of the west. Trains were fast, very luxurious, and quite convenient compared to other forms of transportation existing at the timE.However, times change and the automobile became America's standard of conveniencE.Also, air travel had easily established itself as the fastest method of traveling great distances. Therefore, the task for DDB Needham was to encourage consumers to consider other aspects of train travel in order to change their attitudes and increase the likelihood that trains would be considered for travel in the west.Two portions of the total market were targeted: 1) anxious fliers—those concerned with safety, relaxation, and cleanliness; 2) travel-lovers—those viewing themselves as relaxed, casual, and interested in the travel experience as part of their vacation. The agency then developed a campaign that focused on travel experiences such as freedom, escape, relaxation, and enjoyment of the great western outdoors. It stressed experiences gained by using the trains and portrayed western train trips as wonderful adventures.Advertisements showed pictures of the beautiful scenery that could be enjoyed along some of the more famous western routes and emphasized the romantic names of some of these trains (Empire Builder, etC.).These ads were strategically placed among family-oriented TV shows and programs involving nature and America in order to most effectively reach target audiences. Results were impressivE.The Empire Builder, which was focused on in one ad, enjoyed a 15 percent increase in profits on its Chicago to Seattle routE.What's the author's purpose in writing this passage?A.To show the inability of trains to compete with planes with respect to speed and conveniencE.B.To stress the influence of the automobile on America's standard of conveniencE.C.To emphasize the function of travel agencies in market promotion.D.To illustrate the important role of persuasive communication in changing consumer attitudes.
A.B.
C.
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E.
What's
F.To
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B.To
H.
C.To
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D.To -
未知题型
How much sleep does a person need?【B1】the physiological bases of the need for sleep remain conjectural(猜想), rendering conclusive answers to this question impossible, much evidence has been gathered on how much sleep people do in fact obtain. Perhaps the most important conclusion to be【B2】from this evidence is【B3】there is great variability among individuals in total sleep timE.For adults,【B4】between six and nine hours of sleep as a nightly average is not unusual, and 7.5 hours probably best expresses the norm. Such norms, of course, forms inevitably vary with the criteria of sleep employeD.The most【B5】and reliable figures on sleep time, including those cited here, come from studies in sleep laboratories, where EEO criteria are employeD.【B6】consistently has been associated with the varying amount, quality, and pattern of electrophysiologically defined sleep. The newborn infant may spend an average of about 16 hours of each 24-hour period in sleep,【B7】the sleep time drops sharply; by two years of age, it may【B8】from nine to 12 hours. Decreases to approximately six hours have been observed among the elderly.【B9】will be discussed from below, EEO sleep studies have indicated that sleep can be considered to consist of several different stages. Developmental changes in the relative proportion of sleep time【B10】in these sleep stages are as striking as age-related changes in total sleep timE.【B1】A.AsB.DespiteC.WhileD.Whether
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【B1】
A.As
B.Despite
C.While -
未知题型
表达式Left('how are you',3)的值是are you
A.how
B.are
C.you
D.how
