首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Canal Today, most countries in the world have canals. Even in the twentieth century, goods can be moved more cheaply by boat(51)
Canal Today, most countries in the world have canals. Even in the twentieth century, goods can be moved more cheaply by boat(51)
admin
2009-06-15
22
问题
Canal
Today, most countries in the world have canals. Even in the twentieth century, goods can be moved more cheaply by boat(51) by any other means of trans- port. Some canals, such as the Suez or the Panama,(52) 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(53) lands where there is too much water, help or irrigate fields where there is not enough water, and furnish water power for factories and mills.
The(54) of a canal depends on the kind of boats going through it. The canal must be wide enough to permit two of the(55) boats using it to(56) each other easily. It must be deep enough to leave about two feet of water(57) the keel of the largest boat using the canal. Some canals have sloping sides,(58) others have sides that are nearly vertical. Canals that are cut through rock can have nearly vertical sides. However, canals with earth banks may crumble if the angle of their sides is too steep.
Some canals are lined with brick, stone, or concrete to keep the water(59) soaking into the mud. This also permits ships to go(60) greater speeds, since they cannot make the banks fall in by stirring up the water. In small canals with mud banks, ships and barges must(61) their speed.
When the canal goes(62) different levels of water, the ships must be raised or lowered from one level to the other, This is generally done by means of locks. If a ship wants to go up to higher water, the lower end of the lock opens to let the boat in. Then this gate closes, and the water is let into the lock chamber from the upper level. This raised the level of the water in the lock(63) it is the same as the upper level of water.
Now the upper gates can be opened to(64) the ship into the higher water. Of course there must always be enough water on the upper level to allow for the flooding of the lock. Sometimes a canal contains a(65) of locks when the difference in levels is very great.
选项
A、away
B、from
C、upon
D、off
答案
B
解析
keep from doing意为“防止”,这里的句意是:运河用砖头等砌在周围来防止水的渗透。keep away意为“避开、离开”,keep off意为“避开、不接近”。
转载请注明原文地址:https://kaotiyun.com/show/JAFd777K
本试题收录于:
职称英语综合类B级题库职称英语分类
0
职称英语综合类B级
职称英语
相关试题推荐
TheWeightExperimentNicolaWaltershasbeentakingpartinexperimentsinScotlandtodiscoverwhyhumansgainandlosewe
Whatdoesthewritersuggestinthefirstparagraphaboutourattitudestomobilephones?Itissuggestedthatmobilephonessh
Somepeopledreambutcannotremembertheirdreams.Werarelysmellthingsindreams.
InBritainandmanyothercountriesappraisalisnowatoolofmanagement.
A.ThePlanetUranusIsNamedAfterGreekGodB.Theplanetsconcepthasn’talwaysbeenacceptedC.SometimesItTakesaLittle
TheGreatestMysteryOfWhalesThewhaleisawarm-blooded,air-breathinganimal,givingbirthtoitsyoungalive,suckingth
TheGreatestMysteryOfWhalesThewhaleisawarm-blooded,air-breathinganimal,givingbirthtoitsyoungalive,suckingth
EruptionsofMountSaintHelensOnMarch27,theUSGovernmentscientistsmadeadecisionaftertheypredictedtheeruptiono
SoWhatAmanwascominghomelateonenight—aboutthreeo’clockinthemorning—whenhesawaguystandinginfrontofahou
ImproveComputer-researchSkillsLikemanycollegestudents,JoseJuarezcarriesaroundapocket-sizedcomputerthatletshi
随机试题
就像连锁商店的普通主顾那样,琳达大约在每周三光顾一次连锁店。今天她是为自己的孩子伊安购买婴儿尿布,但她还选购了一条系狗的皮带和给自己买了一双应季跑鞋。在她将商品从购物车上卸下时,店家把产品扫描输入连锁店的电脑,电脑根据她的购买情况产生了一个“影子琳达”。
Wegotupearlythismorningand【61】alongwalkafterbreakfast.Wewalkedthroughthebusiness【62】ofthecity.Thecity【63
男性,38岁。低热、乏力2年,近半年四肢关节、肌肉酸痛,登三楼困难,同时在眼睑、鼻梁及面颊部出现红色皮疹,吞咽硬食困难。体检:眼睑周围水肿,眼睑、鼻梁、面颊、远端指间关节及甲周皮肤有暗紫色红斑。为明确诊断最佳辅助检查是
A.阴阳B.寒热C.虚实D.善恶E.气血阴疮一证,当首先辨别
我国选举法明确规定:全国人民代表大会和地方各级人民代表大会的选举经费,由下列选项中的哪一机关开支?()
根据下列资料,回答下列问题。下列说法与资料相符的是:
对人的身心发展起主导作用的是
试论述当代国外课程改革的共同趋势。
OneareainwhichLondonstillsurpassesitsrivalsisthenumberofinternationalvisitorsitreceives:morethananyotherin
MeasurestocombatinfectiousdiseaseintsaristRussiaAInthesecondhalfoftheseventeenthcentury,Russianauthoritiesbeg
最新回复
(
0
)