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截至目前,贵州水能的理论总蕴藏量居全国(  )。

发布日期:2021-06-22

截至目前,贵州水能的理论总蕴藏量居全国(  )。
A

第二位

B

第五位

C

第六位

D

第八位

试题解析

蕴藏量

指埋藏在地球内的某种资源已探明储量和预测储量之和,是地球上某一种、某一类或各种资源量的总和。蕴藏量只具物质概念,没有考虑其经济性质。对于不可再生资源而言,其蕴藏量是一定的,它随着开采而逐步减少;而对于可再生资源而言,蕴藏量是个变量。例如:世界水力资源的理论蕴藏量38亿千瓦,可开发的有11万千瓦/小时。

中文名
蕴藏量
实例
煤矿蕴藏量、石油蕴藏量
类别
变量
外文名
standing stock
学科
能源工程
定义
资源已探明储量和预测储量之和

水能

水能是一种能源,是清洁能源,是绿色能源,是指水体的动能、势能和压力能等能量资源。水能是一种可再生能源,水能主要用于水力发电。水力发电将水的势能和动能转换成电能。以水力发电的工厂称为水力发电厂,简称水电厂,又称水电站。水力发电的优点是成本低、可连续再生、无污染。缺点是分布受水文、气候、地貌等自然条件的限制大。容易被地形、气候等多方面的因素所影响,国家还在研究如何更好的利用水能。

中文名
水能
拼音
shuǐ néng
内容
水体的动能、势能和压力能等能量资源
外文名
Water Energy
注音
ㄕㄨㄟˇ ㄣㄥˊ
能源分类
可再生能源

全国

全国,1984年7月出生,汉族,广东廉江人,研究生学历,法学硕士学位,2009年7月参加工作,2003年3月加入中国共产党。现任广东省中山市小榄镇党委副书记(挂职,时间2年)。    

中文名
全国
籍贯
广东廉江
民族
汉族
出生日期
1984年7月

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Many were built using specifications of 19th century Scottish engineers Thomas Telford and John MacAdam (for whom the macadam surface is named), whose specifications stressed the importance of adequate drainage. Beyond that, there were no national standards for size, weight restrictions, or commercial signs. During World War I, roads throughout the country were nearly destroyed by the weight of trucks. When General Eisenhower returned from Germany in 1919, after serving in the U.S. Army’s first transcontinental motor convoy (车队), he noted,“The old convoy had started me thinking about good, two-lane highways, but Germany’s Autobahn or motorway had made me see the wisdom of broader ribbons across the land.”  It would take another war before the federal government would act on a national highway system. During World War II, a tremendous increase in trucks and new roads were required. The war demonstrated how critical highways were to the defense effort. Thirteen percent of defense plants received all their supplies by truck, and almost all other plants shipped more than half of their products by vehicle. The war also revealed that local control of highways had led to a confusing variety of design standards. Even federal and state highways did not follow basic standards. Some states allowed trucks up to 36,000 pounds, while others restricted anything over 7,000 pounds. A government study recommended a national highway system of 33,920 miles, and Congress soon passed the Federal-Aid Highway Act of 1944, which called for strict, centrally controlled design criteria.  The interstate highway system was finally launched in 1956 and has been hailed as one of the greatest public works projects of the century. To build its 44,000-mile web of highways, bridges and tunnels, hundreds of unique engineering designs and solutions had to be worked out. Consider the many geographic features of the country: mountains, steep grades, wetlands, rivers, deserts, and plains. Variables included the slope of the land, the ability of the pavement to support the load, the intensity of road use, and the nature of the underlying soil. Urban areas were another problem. Innovative designs of roadways, tunnels, bridges, overpasses, and interchanges that could run through or bypass urban areas soon began to weave their way across the country, forever altering the face of America.  Long-span, segmented-concrete, cable-stayed bridges such as Hale Boggs in Louisiana and the Sunshine Skyway in Florida, and remarkable tunnels like Fort McHenry in Maryland and Mt. Baker in Washington, met many of the nation’s physical challenges. Traffic control systems and methods of construction developed under the interstate program soon influenced highway construction around the world, and were invaluable in improving the condition of urban streets and traffic patterns.  Today, the interstate system links every major city in the U.S., and the U.S. with Canada and Mexico. Built with safety in mind, the highways have wide lanes and shoulders, dividing medians or barriers, long entry and exit lanes, curves engineered for safe turns, and limited access. The death rate on highways is half that of all other U.S. roads (0.86 deaths per 100 million passenger miles compared to 1.99 deaths per 100 million on all other roads).  By opening the North American continent, highways have enabled consumer goods and services to reach people in remote and rural areas of the country, spurred the growth of suburbs, and provided people with greater options in terms of jobs, access to cultural programs, health care, and other benefits. Above all, the interstate system provides individuals with what they cherish most: personal freedom of mobility.  The interstate system has been an essential element of the nation’s economic growth in terms of shipping and job creation: more than 75 percent of the nation’s freight deliveries arrive by truck; and most products that arrive by rail or air use interstates for the last leg of the journey by vehicle. Not only has the highway system affected the American economy by providing shipping routes, it has led to the growth of spin-off industries like service stations, motels, restaurants, and shopping centers. It has allowed the relocation of manufacturing plants and other industries from urban areas to rural.  By the end of the century there was an immense network of paved roads, residential streets, expressways, and freeways built to support millions of vehicles. The highway system was officially renamed for Eisenhower to honor his vision and leadership. 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