简述水利工程对环境的影响。

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问题:

简述水利工程对环境的影响。

考点:环境水利环境水利题库
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我们经常看到的人行道上由各种地砖铺砌成美丽的图案,构成图案的每一块地砖都是全等图形吗?请你自己设计一种地砖,让每一块地砖都是全等的,并且能够密铺(拼在一起没有缝隙、没有重叠)成美丽的图案.

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The central problem of economics is to satisfy the people’s and nation’s wants. The problem we are faced with is that our (1) , here identified as money, are (2) . The only way we can resolve our (3) is to make choices. After looking at our resources, we must examine our list of (4) and identify the things we need (5) , those we can postpone, and (6) we cannot afford. As individuals, we face the central problem involved in economics — deciding just how to allocate our limited resources to provide ourselves with the greatest (7) of our wants.
Nations face the same problem. As a country’s population (8) , the need for more goods and services grows (9) . Resources necessary to production may increase, but there are (10) enough resources to satisfy the total desires of a (11) . Whether the budget meeting is taking place in the family living-room, in the conference room of the corporation (12) of directors, or in the chamber of the House of Representatives in Washington, the basic problem still exists. We need to find (13) of allocating limited resources in order to satisfy unlimited wants.
A short time ago, economists divided goods into two categories, free and economic. The former, like air and water, were in (14) abundance that economists had no concern about (15) of scarcity and what to do about it. Today many of these "free goods" are in (16) very expensive to use. Pollution has made clean air and water expensive for producers who have to filter their waste products, for consumers who ultimately pay for the producers’ extra costs, and (17) tax-payers who pay for the government’s involvement in cleaning the environment.
In the 1990s, almost all goods are (18) . Only by effort and money can they be (19) in the form people wish.
Meeting the needs of people and the demands from resources available leads to the basic activity of production. In trying to (20) unlimited wants from limited economic goods, production leads to new problems in economics.

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苏木性状特征是

A.呈长圆柱形或对剖半圆柱形

B.表面黄红色至棕红色,具刀削痕

C.质坚硬,横切面略具光泽,年轮明显

D.气香,味微苦

E.可见带亮星的髓部

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以下对有关盗毒蛾说法正确的是()

A.没有趋光性

B.以幼虫越冬

C.有趋光性

D.雌蛾寿命较雄蛾长

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根据证券法律制度的规定,下列主体中,对招股说明书中的虚假记载承担过错责任的是()。

A.发行人

B.承销人

C.实际控制人

D.保荐人

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