题目

下列不是崩岗主要要素的是()。
A.集水区
B.洪积扇
C.崩壁
D.分水岭

相关标签：集水区分水岭

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相关试题

在地表水和地下水分水线所包围的集水区域称为是（）。

A水域
B流域
C水资源
D地下水

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流域不具有（　　）。

A、地面集水区域

B、地下集水区域

C、地面分水线

D、大片地下岩溶区

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Questions 26 to 30 are based on the following passage.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 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 not only in square measure of surface but also in cubic volume above the earth. In brief, it should be our goal to restore as much of the original beauty of nature as we can.

第26题：The author’s attitude towards the current situation in the exploitation of natural resources is ________.

A) positive

B) neutral

C) suspicious

D) critical

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水量平衡指一个集水区内储水量的变化等于收入与支出的差额，公式表示为w=P-(Is+Et+Qs+Qss)，式中：w—土壤储水增量;P—降水量;Is—林冠裁留量;Qs—地表径流量;Qss—壤中径流量;那么Et代表什么？

A.蒸发量

B.蒸腾量

C.蒸散量

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读图甲“某区域水系图”和图乙“沿汉中-西安一线剖面图”，回答下列问题。小题1:目前，丹江口水库集水区为南水北调中线工程水源区。结合图甲，下列叙述正确的是