更多"[单选题]题目 20--Three-D printing techno"的相关试题:
[单项选择]xdenotes the greatest integer less than or equal to x. Isx=1
(1)x＞1
(2)x＜2
A. 条件(1)充分，但条件(2)不充分．
B. 条件(2)充分，但条件(1)不充分．
C. 条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分．
D. 条件(1)充分，条件(2)也充分．
E. (E) 条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．
[单项选择]An animal weighing less than 2.5 grams would starve because it would not be able to ______.
A. get enough oxygen
B. maintain its body temperature
C. bum its food fast enough
D. eat fast enough to supply fuel
[Part III Reading Comprehension]
Knowing that you are paid less than your peers has two effects on happiness. The well-known one is negative: a thinner pay packet harms self-esteem. The lesser-known one is called the "tunnel" effect; high incomes for peers are Seen as improving your own chances Of similar riches, especially if growth, inequality and mobility are high.
A paper co-authored by Felix FitzRoy of the University of St. Andrews and recently presented at the Royal Economic Society in Cambridge separates the two effects using data from household surveys in Germany. Previous work showed that the income of others can have a small, or even positive, overall effect on people's satisfaction in individual firms in Denmark or in very dynamic economies in transition, such as eastern Europe. But Mr. FitzRoy's team theorized that older workers, who largely know their lifetime incomes already, will enjoy a much smaller tunnel effect.
The data confirm this hypothesis. The negative effect on reported levels of happiness of being paid less than your peers is not visible for people aged under 45. In western Germany, seeing peers' incomes rising actually makes young people happier (even more than a rise in their own incomes, remarkably) . It is only those people over 45, when careers have "reached a stable position" whose happiness is harmed by the success of others. The prospect of 20 -plus years of bitterness might make retirement seem more appealing. But the real gains in happiness from retirement go not to the Outshone , but to the Out-of-work. Unemployment is known to damage happiness because not working falls short of social expectations. This loss of identity cannot be compensated for by unemployment benefits or increased leisure time. A paper presented at the same conference by a team represented by Clemens Hetschko of the Free University of Perlin uses the same German household data to show that the spirits of the long-term unemployed rise when they stop looking tor work, go into retirement and no longer clash with social norms.
Those with jobs are no happier after they retire, however, perhaps because their lives already line up With social expectations. Indeed, retiring early from work can have nasty side-effects. Another paper, co-authored by Andreas Kuhn of the University of Zurich, investigates the effect of a change in Austrian employment insurance rules that allowed blue-collar workers earlier retirement in some regions than Others. Men retiring a year early lower their chances of surviving to age 67 by 13%. Almost a third of this higher mortality rate, which seemed to be concentrated among those who forced into retirement by -job loss, was caused by smoking and alcohol consumption. If you're in a job, even an underpaid one, hang on in there.
What did the study conducted by Mr. FitzRoy's team reveal?
A.The findings of previous work may be problematic
B.The two effects of peers' incomes on happiness cannot separated.
C.Older workers are not affected by the income of others
D.Older workers have already known their lifetime incomes
[单项选择]Australia，with less than a tenth of America's population，last year earned $2 billion on foreign education．
A. 澳大利亚以少于美国十分之一的人力，去年在国外办教育赚了20亿美元。
B. 澳大利亚，少于美国人口的十分之一，去年在国外教育上赚了20亿美元。
C. 澳大利亚的人口尽管不到美国的十分之一，去年的留学生教育赚了20亿美元。
D. 澳大利亚，一个比美国人口少十分之一的国家，去年在对留学生的教育上赚了20亿美元。
[单项选择]Australia, with less than a tenth of America' s population, last year earned $ 2billion on foreign education.
A. 澳大利亚以少于美国十分之一的人力，去年在国外办教育赚了20亿美元。
B. 澳大利亚，少于美国人口的十分之一，去年在国外教育上赚了20亿美元．
C. 澳大利亚的人口尽管不到美国的十分之一，去年的留学生教育赚了20亿美元。
D. 澳大利亚，一个比美国人口少十分之一的国家，去年在对留学生的教育上赚了20亿美元。
[单项选择]He has （） 1,000 in less than a week.
A. got through
B. got out of
C. given out
D. gone over
[单选题]Flight altitudes in the holding area: from 600m upward, there is a flight altitude for every 300m. The true height between the lowest holding altitude and the highest obstacle should not be less than _______ m, the true height between the lowest holding altitude and the initial altitude in an instrument approach should not be less than _______ m.
A.600, 300
B.300, 600
C.900, 600
D.600, 900
[单项选择]It is absurd that women ______ be paid less than men for doing the same work.
A. are to
B. ought
C. would
D. should
[单项选择]There are no less than 3,000 students ______ Chinese here.
A. study
B. to study
C. studied
D. studying
[单项选择]Telecommuting is much less expensive than commuting to work every day.
[单项选择]Western Nebraska generally receives less snow than _______ eastern Nebrask
A. A． doesB. inC. it does inD. in it does
[单选题]When visibility is less than 800m, the minimum criteria for takeoff and landing are expressed in _______ .
A.RVR
B.VIS
C.ceiling
D.wind speed direction and speed
[单选题]When dominant visibility or runway visual range is less than _______ m, air traffic control unit should report RVR.
A.3000
B.2500
C.2000
D.1500
[单项选择]The cost of my house is higher than （ ） of his.
A. any
B. cost
C. that
D. it
[单选题]In aerial photography flight, the safety altitude between the aircraft and obstacles in mountainous areas should not be less than _______ m.
A.100
B.200
C.300
D.400
[单选题]题目 69
--So far, Su Bingtian is the only Chinese who finished the 100-meter race in less than 10 seconds.
-- ( ) he runs!
A. How show
B. How fast
C. What a slow
D. What a fast
[单选题] The width of airway is _______ km, and due to some constraints, should not be less than _______km.
A.10, 5
B.20, 8
C.15, 7.5
D.30, 15
