首页
登录
职称英语
[originaltext] Today, most countries in the world have canals. Even in the 2
[originaltext] Today, most countries in the world have canals. Even in the 2
游客
2023-09-12
12
管理
问题
Today, most countries in the world have canals. Even in the 20th century, goods can be moved more cheaply by boat that any other means of transport. Some canals such as the Suez or the Panama, save ships weeks of time by making their voyage a thousand miles shorter. Other canals permit boats to reach cities that are not located on the coast. Still other canals drain lands where there is too much water, help to irrigate fields where there is not enough water.
In places where it does not rain very often, irrigation canals drain water from rivers or lakes such as the lake behind the Aswan Dam on the Nile River, and provide the irrigation water.
In places where there is too much water, canals can drain the water off the land for use in fanning. In Holland, acres and acres of land have been drained in this way. Since much of this drained land is below sea level, the water in the canals has to be pumped up to sea level. Dikes have been built in Holland to keep the sea from covering the land, as it did in the past.
Canals are also used to carry water to mills and factories. The water from a river is kept at a higher level than the river until it reaches the wheel of the mill. Then the water is poured over un61 it reaches the wheel of the mill. Then the water is poured over the mill wheel, making it turn. The same principle is used in more modern factories and in hydroelectric generating plants. The force of the water, falling from a certain height, provides a cheap way of producing electricity.
选项
A、Cheaper and sometimes faster.
B、More expensive, but faster.
C、Cheaper. but more dangerous.
D、Moro expensive and slower.
答案
A
解析
转载请注明原文地址:https://www.tihaiku.com/zcyy/3006983.html
相关试题推荐
[originaltext]Ithasbeenofficiallyacknowledgedthattheincomegapisa
[originaltext]Ithasbeenofficiallyacknowledgedthattheincomegapisa
[originaltext]ExpertssaysomefarmingactivitiesareseriouslydamagingEa
[originaltext]Yearsagobeforetherewererefrigerators,anicehousewasa
[originaltext]W:Somanypeoplefeartotalkaboutdrugs.Soprofessor,wouldy
[originaltext]W:Somanypeoplefeartotalkaboutdrugs.Soprofessor,wouldy
[originaltext]ThecolorfulInternetdrawsustocomputersandbringsusjoy
[originaltext]ThecolorfulInternetdrawsustocomputersandbringsusjoy
[originaltext]ThecolorfulInternetdrawsustocomputersandbringsusjoy
[originaltext]W:Hello,John,youmustbepleased.Afterall,howmanystudents
随机试题
[originaltext]ManyhaveheadedtoNashville,Tenn.,withnothingbutaguit
I()onthedoorfortenminutesnowwithoutananswer.A、wasknockingB、amknocki
CreativeDestructionofHigherEducationA)Highereducation
AR/VR产品制作的环节包括( )。A.媒体素材获取与管理 B.程序实现
近日,居民梁大妈带病来到社区居委会,诉说其儿媳妇李梅不履行赡养老人的义务,拒付其
以下不属于内囊型感觉障碍的表现的是:A.“三偏征” B.偏瘫 C.偏盲 D
足三阳经的循行规律是()A.从胸走手 B.从足走头 C.从头走足
下列有关可转换公司债券价值与各影响因素之间的关系表述中,正确的有()。A:回售期
布卢姆将情感领域的教学目标根据价值内化的程度分为五个等级:接受、()、
A.板蓝根与大青叶 B.阿魏与鸡矢藤 C.陈皮与青皮 D.山药与天花粉
最新回复
(
0
)