首页
登录
职称英语
Today, most countries in the world have canals. Some canals, such as the Sue
Today, most countries in the world have canals. Some canals, such as the Sue
游客
2023-09-03
36
管理
问题
Today, most countries in the world have canals. Some canals, such as the Suez or the Panama,【C1】______ 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.【C2】______ other canals drain lands where there is too much water, help or【C3】______ fields where there is not enough water.
The【C4】______ of a canal depends on the kind of boats going through it. The canal must be wide enough to permit two of the【C5】______ boats using it to【C6】______ each other easily. It must be deep enough to leave about two feet of water【C7】______ the keel of the largest boat using the canal.
Some canals have sloping sides, while others have sides that are nearly【C8】______ Canals that are cut through rock can have nearly Vertical sides.【C9】______ , canals with earth banks may【C10】______ if the angle of their sides is too steep. Some canals are lined with brick, stone, or concrete to keep the water【C11】______ soaking into the mud. This also permits ships to go at【C12】______ speeds, since they cannot make the banks fall in by【C13】______ up the water. In small canals with mud banks, ships and barges (大平底船) must【C14】______ their speed.
When the canal goes【C15】______ different levels of water, the ships must be【C16】______ or lowered from one level to the other. This is generally done by【C17】______ 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 【C18】______ it is the same as the upper level of water. Now the upper gates can be opened to【C19】______ the ship into the higher water. Sometimes a canal contains a series of locks when the【C20】______ in levels is very great. [br] 【C17】
选项
A、ways
B、methods
C、means
D、approaches
答案
C
解析
by means of是固定搭配,意为“通过…,用…方法”。
转载请注明原文地址:https://tihaiku.com/zcyy/2982432.html
相关试题推荐
Thisgreat______joinsthetwoareaswhichbelongtodifferentcountries.A、cane
AlthoughAsiancountriesaregenerallymore______insocialcustomsthanWester
Itis______inWesterncountriestogivepeoplegiftsontheirbirthdays.A、cohe
Relationsbetweenthetwocountrieshave______sincetheagreementwassigned.A、
[originaltext]Amongwesternrichcountries,peopleintheUnitedStateswor
[originaltext]Amongwesternrichcountries,peopleintheUnitedStateswor
[originaltext]Amongwesternrichcountries,peopleintheUnitedStateswor
Immigrationfromcountriesandculturesthatare________withtheculturalcore
Relationsbetweenthecountrieswereformally______in1997.A、mechanizedB、norm
Relationsbetweenthecountrieswereformally______in1997.A、mechanizedB、norm
随机试题
DoctorssaidthatLorenzomightdiewithinthreeyearsbecause________.[br]Lo
Populationshave3agents,namely,abirthrate,adeathrate,andagrowthrate
[originaltext]M:Forpoliticalheavyweightit’sbeenadelicatebalancingact,
Asanxiety-makers,examinationsaresecondtonone.Thatisbecausesomuch
[originaltext]W:Whenwasthelasttimeyouwentforawalkinyourlocalpark?
1982年国务院发布《村镇建房用地管理条例》之前,农村居民建房占用宅基地,超过当
有关破伤风的护理措施错误的是A.病人要执行血液隔离 B.安置病人在单独暗室
改革开放以前,我国国有企业获得自有资本的主要来源是( )。 A.吸收直接投
根据土地利用总体规划,铁路、公路等交通沿线,城市和村庄、集镇建设用地区周边耕地,
药品批发企业高层管理人员中全面负责药品质量管理工作的人员应具有A.执业药师 B
最新回复
(
0
)