在关系运算中, 【4】 运算是对两个具有公共属性的关系所进行的运算。

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问题:

在关系运算中, 【4】 运算是对两个具有公共属性的关系所进行的运算。

考点:计算机等级考试VISUALFOXPRO二级VISUALFOXPRO笔试385
题型:填空题

My mother ____________ very happy yesterday.[ ]

A. was

B. is

C. are

题型:填空题

赵某向李某借款10万元,赵某将自己的汽车作价5万元抵押给李某,未约定担保数额,并依法进行了抵押登记。后一次事故使汽车报废,保险公司赔偿8万元。赵某与李某之间的抵押关系:

A.应归于消灭

B.继续有效,应以保险赔偿金中的5万元继续担保赵某对李某的债务

C.继续有效,应以全部保险赔偿金8万元继续担保赵某对李某的债务

D.终止,赵某应以保险赔偿金提前清偿李某

题型:填空题

  For those who make journeys across the world, the speed of travel today has turned the countries into a series of villages.Distances between them appear no greater to a modern traveler than those which once faced men as they walked from village to village. Jet planes fly people from one end of the earth to the other, allowing them a freedom of movement undreamt of a hundred years ago.

  Yet some people wonder if the revolution in travel has gone too far. A price has been paid, they say, for the conquest (征服) of time and distance. Travel is something to be enjoyed, not endured (忍受).  The boat offers leisure and time enough to appreciate the ever-changing sights and sounds of a journey. A journey by train also has a special charm about it. Lakes and forests and wild, open plains sweeping past your carriage window create a grand view in which time and distance mean nothing. On board a plane, however, there is just the blank blue of the sky filling the narrow window of the airplane. The soft lighting, in-flight films and gentle music make up the only world you know, and the hours progress slowly.

   Then there is the time spent being “processed” at a modern airport. People are conveyed like robots along walkways; baggage is weighed, tickets produced, examined and produced yet again before the passengers move to another waiting area. Journeys by rail and sea take longer, yes, but the hours devoted to being “processed” at departure and arrival in airports are luckily absent. No wonder, then, that the modern high-speed trains are winning back passengers from the airlines.

  Man, however, is now a world traveler and cannot turn his back on the airplane. The working lives of too many people depend upon it; whole new industries have been built around its design and operation. The holiday maker, too, with limited time to spend, patiently endures the busy airports and limited space of the flight to gain those extra hours and even days, relaxing in the sun. speed controls people’s lives; time saved, in work or play, is the important thing—or so we are told. Perhaps those first horsemen, riding free across the wild, open plains, were enjoying a better world than the one we know today. They could travel at will, and the clock was not their master.

小题1:What does the writer try to express in Paragraph 1?

A.Travel by plane has speeded up the growth of villages.

B.The speed of modern travel has made distances relatively short.

C.The freedom of movement has helped people realize their dreams.

D.Man has been fond of traveling rather than staying in one place.小题2:How does the writer support the underlined statement in Paragraph 2?

A.By giving instructions.

B.By analyzing cause and effect.

C.By following the order of time.

D.By giving examples.小题3:According to Paragraph 3, passengers are turning back to modern high-speed trains because______.

A.they pay less for the tickets

B.they feel safer during the travel

C.they can enjoy higher speed of travel

D.they don’t have to waste time being “processed”小题4:What does the last sentence of the passage mean?

A.They could enjoy free and relaxing travel.

B.They needed the clock to tell the time.

C.They preferred traveling on horseback.

D.They could travel with their master.小题5:What is the main idea of the passage?

A.Air travel benefits people and industries.

B.Train Travel has some advantages over air travel.

C.Great changes have taken place in modern travel.

D.The high speed of air travel is gained at a cost.

题型:填空题

股票上市的目的不包括( )。

A.便于筹措新资金
B.促进股权流通和转让
C.便于确定公司价值
D.降低企业资本成本

题型:填空题

吸痰前后,需要观察患者的氧合,重点观察内容是:()

A.双肺呼吸音

B.纯氧吸入

C.血氧饱和度变化

D.吸痰管的大小

E.患者的神志

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