当前位置:考试网  > 试卷库  > 技能鉴定  > 其他类  > 水利设施管养人员  > 水土保持防治工  > 水土流失有什么危害?
试题预览

水土流失有什么危害?

查看答案
收藏
纠错
正确答案:

1、使土地生产力下降甚至丧失

2、淤积河道、湖泊、水库

3、污染水质影响生态平衡

答案解析:

暂无解析

你可能感兴趣的试题

塑造了“开辟洪荒的大我”的抒情主人公形象的是郭沫若的诗集()。

《中山狼传》中,最后击毙中山狼,救出东郭先生的是()

中国历史上第一次用碑刻经书的方式对经典语言文字进行规范的伟大工程是()

《乡村四月》的作者是()

春秋时期的思想家更像学者、牧师,而战国时期的思想家更像()

热门试题 更多>
试题分类: 施工员
练习次数:0次
Passage 2 Questions 6 to 10 are based on the following passage: In order to learn to be one’s true self, it is necessary to obtain a wide and extensive knowledge of what has been said and done in the world; critically to inquire into it; carefully to consider it; clearly to analyze it; and earnestly to carry it out. It matters not what you learn, but when you once learn a thing, you must never give it up until you have mastered it. It matters not what you inquire into, but when you once inquire into a thing, you must never give it up until you have thoroughly understood it. It matters not what you try to think out, but when you once try to think out a thing, you must never give it up until you have got what you want. It matters not what you try to carry out, but when you once carry out a thing, you must never give it up until you have don’t it thoroughly and well. If another man succeeds by one effort, you will use a hundred efforts. If another man succeeds by ten efforts, you will use a thousand. 6. According to the author, first of all one must . A. analyze B. inquire C. obtain knowledge D. act 7. According to the author, . A. learning is not important B. thinking is not necessary C. knowledge means little D. it is not important what we learn 8. The end of learning should be . A. thought B. mastery C. inquiry D. analysis 9. According to the author, another man’s success should . A. make greater efforts B. make us nervous C. not be taken into consideration D. cause one to stop trying 10. The author implies but does not say what . A. the way to knowledge is through specialization B. one has to know everything to be successful C. success depends not so much on natural ability as it does on effort D. success in one’s profession is latest important in one’s life
试题分类: 大学英语四级
练习次数:16次
Part I Reading Comprehension Directions: In this part there are four passages. Each passage is followed by four comprehension questions. Read the passage and answer the questions. Then mark your answer on the Answer Sheet. Passage 1 Questions 1 to 5 are based on the following passage: Ask three people to look the same window at a busy street corner and tell you what they see. Chances are you will receive three different answers. Each person sees the same scene, but each perceives something different about it. Perceiving goes on in our minds. Of the three people who look out the window, one may say that he sees a policeman giving a motorist a ticket. Another may say that he sees a rush-hour traffic jam at the intersection. The third may tell you that he sees a woman trying to cross the street with four children in tow. For perception is the mind’s interpretation of what the senses—in this case our eyes—tell us. Many psychologists today are working to try to determine just how a person experiences or perceives the world around him. Using a scientific approach, these psychologists set up experiments in which they can control all of the factors. By measuring and charting the results of many experiments, they are trying to find out what makes different people perceive totally different things about the same scene. 1. Seeing and perceiving are . A. the same action B. two separate actions C. two actions carried on entirely by eyes D. several actions that take place at different times 2. Perceiving is an action that takes place . A. in our eyes B. only when we think very hard about something C. only under the direction of a psychologist D. in every person’s mind 3. People perceive different things about the same scene because . A. they see different things B. some have better eyesight C. they cannot agree about things D. none of these 4. Which of the following is implied but not stated in the passage? A. Psychologists do not yet know people see. B. The experiments in which all factors are controlled are better. C. The study of perception is going on now. D. Perception does not involve psychological factors. 5. The best title for this selection is . A. How We See B. Learning about Our Minds through Science C. What Psychologists Perceive D. How to Because an Experimental Psychologist
试题分类: 大学英语六级
练习次数:2次
试题分类: 安全员
练习次数:0次
试题分类: 施工员
练习次数:2次
扫一扫,手机做题