滇东南地区某山岭重丘区拟建一个高速公路工程，全长62.05km，其中山岭区长18.9km，设计行程速度80km/h，路基宽22.5m；重丘区43.15km，设计行程速度80km/h，路基宽24.5m。主要工程数量如下：土方287.5万，石方320.4万；特大桥5座，大桥20座；隧道5座，长4740m；立体交叉9处；永久占地291.79k；拆迁建筑物10300；拆迁户数58户，210人。沿途永久占用土地包括水田19.9h，荒地70.3h，经济林0.56h，松杂林68.2h，河沟水体10.89h，道路1.09h：临时占用旱地104h，荒地125.2h。该项目选线横跨南盘江，项目起点K3.0～K4.5，经过作为当地水源地的某水库集水区。
问题：
主要环境要素的评价等级如何确定？

相关问题推荐

The word conservation has a thrifty （节俭）meaning. To conserve is to save and protect, to leave what we ourselves enjoy in such good condition that others may also share the enjoyment. Our forefathers had no idea that human population would increase faster than the supplies of raw materials; most of them, even until very recently, had the foolish idea that the treasures were “limitless” and “inexhaustible”. Most of the citizens of earlier generations knew little or nothing about the complicated and delicate system that runs all through nature, and which means that, as in a living body, an unhealthy condition of one part will sooner or later be harmful to all the others.Fifty years ago nature study was not part of the school work; scientific forestry was a new idea; timber was still cheap because it could be brought in any quantity from distant woodlands, soil destruction and river floods were not national problems; nobody had yet studied long-terms climatic cycles in relation to proper land use; even the word “conservation” had nothing of the meaning that it has for us today.For the sake of ourselves and those who will come after us, we must now set about repairing the mistakes of our forefathers. Conservation should, therefore, be made a part of everyone’s daily life. To know about the water table （水位）in the ground is just as important to us as a knowledge of the basic arithmetic formulas. We need to know why all watersheds （上游源头森林地带集水区）need to the protection of plant life and why the running current of streams and rivers must be made to yield their full benefit to the soil before they finally escape to the sea. We need to be taught the duty of planting trees as well as of cutting them. We need to know the importance of big, mature trees, because living space for most of man’s fellow creatures on this planet is figured out only in square measure of surface but also in cubit volume above the earth. In brief, it should be our goal to restore as much of the original beauty of nature as we can.1.The author’s attitude towards the current situation in the exploitation of natural resources is（） .2.According to the author, the greatest mistake of our forefathers was that（） .3.It can be inferred from the third paragraph that earlier generations didn’t realize（） .4.To avoid correcting the mistake of our forefathers, the author suggests that （）.5.What’s the best title for the passage?

A.positive B.neutral C.suspicious D.critical
问题2：
A.they had no idea about scientific forestry B.they had little or no sense of environmental protection C.they were not aware of the significance of nature study D.they had no idea of how to make good use of raw materials
问题3：
A.the interdependence of water, soil, and living things B.the importance of the proper use of land C.the harmfulness of soil destruction and river floods D.the value of the beauty of nature
问题4：
A.we plant more trees B.natural science be taught to everybody C.environmental education be directed toward everyone D.we return to nature
问题5：
A.Our Forefathers’ Big Mistake B.Improve the Living Conditions C.Protection of Our Resources D.Lead a Simple Life

查看答案

某山岭重丘区三级公路，所经地区积雪季节较长。试问在纵坡设计时，平曲线半径为100m的弯道上，其最大纵坡不应超过何值？（μ＝0.05，ｉ合＝0.08）

查看答案