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
2024-09-24
19
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] 【C20】
选项
A、distance
B、variance
C、contrast
D、difference
答案
D
解析
前面提到,控制船的升高或降低是通过水闸来完成的。再根据所填词前面的a series of locks可知,此处是表示当水位差很大时,需通过一系列水闸的开关来使船通过,故答案为[D]difference。[A]distance“距离,间距”;[B]variance“变动,分歧”;[C]contrast“对比,对照”。
转载请注明原文地址:https://tihaiku.com/zcyy/3771546.html
相关试题推荐
Aseriesofborderincidentswould______leadthetwocountriestowar.A、inevitab
Today,mostcountriesintheworldhavecanals.Somecanals,suchastheSue
Today,mostcountriesintheworldhavecanals.Somecanals,suchastheSue
Today,mostcountriesintheworldhavecanals.Somecanals,suchastheSue
Today,mostcountriesintheworldhavecanals.Somecanals,suchastheSue
Today,mostcountriesintheworldhavecanals.Somecanals,suchastheSue
Today,mostcountriesintheworldhavecanals.Somecanals,suchastheSue
Today,mostcountriesintheworldhavecanals.Somecanals,suchastheSue
Today,mostcountriesintheworldhavecanals.Somecanals,suchastheSue
Today,mostcountriesintheworldhavecanals.Somecanals,suchastheSue
随机试题
Productswhicharemadefromdirtsandare______hightemperaturesareknownasc
Iwasso______onmystudythatIdidn’tnoticethetime.A、preoccupiedB、intentC
Thispartistotestyourabilitytodopracticalwriting.Youarerequiredtow
Hisgrandfatherislookingforwardto______tohisnativeplacesomeday.A、retu
框架-核心筒结构的抗震设计,下列所述的哪一项是不恰当的?()A.核心筒与框架
有5名儿童分别用以下方法服用了脊髓灰质炎糖丸疫苗下列方法中,正确的是 A.温水
治疗虚劳肺痿,应首先考虑的方剂是( )。A.清燥救肺汤 B.炙甘草汤 C.
患者男性,35岁。右下腹突发性绞痛,右肾区酸胀,恶心、呕吐,伴肉眼血尿,诊断为肾
应用成本利润分析法时,需要注意的问题有( )。A.应用成本利润方法计算出来的价
甲公司适用的企业所得税税率为25%,2014年12月20日购人一项不需要安装的固
最新回复
(
0
)