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
38
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
FreeStatinsWithFastFoodCouldNeutralizeHeartRiskFastfoodoutletscouldprovidestatindrugsfreeof【C1】______sotha
TheRobotManAccordingtoHansMoravec,universalrobotswilltakeoverallthephysicalactivitiesthatweengagein,leav
ElectronicMailDuringthepastfewyears,scientistsallovertheworldhavesuddenlyfoundthemselvesproductivelyengaged
AalotofmoneyBBritishpeopleCmorningDlocalpeopleEnationalissuesFlocalissuesLocalnewspapersrarelygiveopinio
ScienceandTechnologyThereisadifferencebetweenscienceandtechnology.【B1】______Sciencehastodowithdiscoveringth
AthevolunteersdoBbecauseshedoesnothaveaweightproblemCbecausethelifetherecanbeveryboringDmakepeopleovere
HowDidSheConquertheAmericans?African-AmericantalkshowqueenOprahWinfreyistheworld’smostpowerfulcelebrity,a
ThewriterbeginsthepassagebycomparingTheword"humanoid"inparagraphImeans
Takingacell,practicallyanycell,fromyourbody,thetheorygoes,andthroughappropriatebiologicaltinkering(摆弄)youcan
Heissaidtobesufferingfromterminalcancerandhasaskedforeuthanasia(安乐死).
随机试题
根据全电路欧姆定律,若E和R不变,当内电阻增大时,电流的变化是()。
伦琴发现了X线,居里夫人发现了镭,随后不久放射线被用于临床治疗,从而为肿瘤的治疗开辟了一条新的途径,放疗设备中第一台深部X线机是在_______出现的并治愈了1例喉癌患者
成年患者,吸入性损伤经支气管镜检查发现:会厌、声门黏膜充血水肿并有坏死斑,隆突处黏膜充血水肿,隆突以下未见明显异常。该患者吸入性损伤的程度为
目前,人们常用的文字处理软件有()。
建设工程项目总监理工程师的基本职责内容包括()。
教师课外辅导应注意的问题是什么?
从宏观上,公安机关权力可以分为()。
下列不属于《刑事诉讼法》规定的电子数据证据种类的是()。
金砖国家领导人第四次会晤于2012年3月28日在印度新德里举行,为了深入了解金砖五国经济社会发展的基本情况,根据国家统计局《金砖国家联合统计手册(2011)》;列表如下:已知我国和巴西的耕地面积分别为12172和6449万公顷,由此可以得
時間がたつ________、悲しいことは忘れていった。
最新回复
(
0
)