首页
登录
职称英语
With the prospect of coal and petroleum supplies running out and with air po
With the prospect of coal and petroleum supplies running out and with air po
游客
2024-06-16
39
管理
问题
With the prospect of coal and petroleum supplies running out and with air pollution becoming an increasing concern, the major countries of the world are seeking alternate sources of energy. If a means to obtain energy from water, especially from the ocean, can be effected economically, it would provide a never-ending supply of energy, since 70% of the earth’s surface is ocean and another 10% is fresh water in rivers and lakes.
From the beginning of time man has used waterpower as a source of working energy—waterfalls and dams—but these are fresh water sources and are landlocked. The seas have contributed little or nothing in the way of power. The use of temperature variation between currents is one area of exploration. Ocean water is heated by the sun near the equator and drawn by the rotation of the earth toward the poles, where it cools and drops toward the ocean floor and starts its journey back toward the equator. The differential between the two currents is l℃ and 7℃. To use it, the scientists must find the places where they run near land and are not too far away from each other.
America, the greatest consumer of energy, has been working on another kind of thermal sea energy proposal. One plan would somewhat resemble the operation of a refrigerator on a vast scale. Warm water would be the heat source, cold water the heat sink. A component such as fog would be liquid at a cold temperature and turn to gas as it warmed.
Oceans also offer wave power, tides and the chemical reaction of salt water as potential sources of energy. All these uses are theoretically possible. Britain is interested in wave power, using a string of "tear drop" devices that depend on very active wave areas at 100 feet depths. In addition to this, the British are working on a method that the Japanese have already put into practical use on a small scale for powering their navigational boats. This method is called an oscillating(振荡) water column and rides the waves with a series of cylinders(气缸) having one-way air valves. Wave movement produces air under pressure that has only one escape route—to a turbine(涡轮) that powers a generator.
选项
A、a new concept compared with other ways of natural resources
B、less expensive than petroleum and other means of energies
C、now being used more from the ocean than from rivers and lakes
D、being developed to supplement other sources of energy
答案
D
解析
水作为能源是一种新的概念,而使用水作为能源由来已久,见第二段第一句,可知A选项是错误的。从文章第一段,尤其是第一段第二句可获知人类正试图利用水资源来弥补其他能量的短缺。D项为正确选项。B,C两项文中未涉及。
转载请注明原文地址:https://tihaiku.com/zcyy/3636175.html
相关试题推荐
【S1】[br]【S10】running—run此句的主语为All,thatyouhavetodo为定语从句。谓语为系动词is。and连接的动词原
FreshwatersuppliesinAsiaandsouthAmericaisdisappearingastheglaciersm
FreshwatersuppliesinAsiaandsouthAmericaisdisappearingastheglaciersm
FreshwatersuppliesinAsiaandsouthAmericaisdisappearingastheglaciersm
【B1】[br]【B4】[audioFiles]audio_eusm_j01_287(20099)[/audioFiles]supplies此处应该填入一
Runningaleverwasoncethoughttobetheprerogativeofwarm-bloodedcreat
Runningaleverwasoncethoughttobetheprerogativeofwarm-bloodedcreat
Runningaleverwasoncethoughttobetheprerogativeofwarm-bloodedcreat
Runningaleverwasoncethoughttobetheprerogativeofwarm-bloodedcreat
Theworldisrunningoutofoil,andenergyexpertsbelievethatthere
随机试题
AssistantToPublicRelationsManagerBusin
Whatistheremainderwhenatwo-digitintegerxisdividedby3?(1)Thesumof
DHCP客户端通过( )方式发送DHCPdiscover消息。A.单播
下列对烧结普通砖特性的描述错误的是( )。A.烧结普通砖是以砂质黏土、页岩、煤
艾滋病的传播方式包括A.性接触传播 B.注射途径传播 C.母婴传播 D.器
A.骶岬 B.髂前上棘 C.坐骨结节 D.坐骨棘 E.髂嵴判断中骨盆是否
复方制剂中的多数药材均采用的粉碎方法是A水飞法 B单独粉碎 C超细粉碎 D
可用胶体金免疫技术检测的项目有A.抗HCVB.HCGC.HIVD.便隐血试验E.
业主大会的法定召集人是()。A:房地产行政主管部门 B:街道办事处或乡镇人民政
下列选项中,不属于个人信贷业务内容的是()。A.个人住房按揭贷款 B.个
最新回复
(
0
)