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【简答题】
In his classic novel, The Pioneer, James Fenimore Cooper has his hero, a land developer, take his cousin on a tour of the city he is building. He describes the broad streets, rows of houses, a teeming metropolis. But his cousin looks around bewildered. All she sees is a forest. 'Where are the beauties and improvements which you were to show me?' She asks. Hes astonished she cant see them. 'Where Why everywhere,' he replies. For though they are not yet built on earth, he has built them in his mind, and they are as concrete to him as if they were already constructed and finished. Cooper was illustrating a distinctly American trait, future-mindedness, the ability to see the present from the vantage point of the future; the freedom to feel unencumbered by the past and more emotionally attached to things to come. As Albert Einstein once said, 'Life for the American is always becoming, never being.'
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雾化罐
B.
螺蚊管
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晶体换能器
D.
电子管
E.
口含嘴
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A.
2n
B.
n-1
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n+1
D.
n
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A.
6 3
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3 2
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A.
n-1
B.
n
C.
2n
D.
n+1
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A.
30°
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60°
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30°或150°
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60°或120°
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60°
B.
30°
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60°或120°
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30°或150°
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叶酸缺乏
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克汀病
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核黄素缺乏
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形式产
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