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
41
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] 【C11】
选项
A、away
B、from
C、down
D、off
答案
B
解析
此处是说防止泥土中渗进水,keep sth.from doing sth.意为“防止某事发生”,故[B]为答案。keep…away“(使)远离…”、keep…down“镇压,减弱”、keep…off“使…不接近;挡开”均与语义不符。
转载请注明原文地址:https://tihaiku.com/zcyy/3771537.html
相关试题推荐
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
Today,mostcountriesintheworldhavecanals.Somecanals,suchastheSue
随机试题
______atinhisway,thesituationdoesn’tseemsodesperate.A、LookingB、Looked
Howcanthestartingoftheuniversitybelike?Itcanbebothexcitingand_____
HangzhouABCExportCorporation182,XihuRoad,HangzhouSeptember15,2015Laws
Fordecades,thetelevisionwastheflagshipofanyconsumer-electronicspro
结合实际,论述教学过程中充分发挥教师指导作用与学生主体性之间的关系。
高强度螺栓孔在征得设计同意的基础上,可以采用气割扩孔,扩孔后的孔径不应超过1.2
超声透射波法所用的声波检测仪器主要有模拟式声波仪和数字式声波仪两大类,其中模拟式
粪类圆线虫的病原学诊断中错误的方法是A.主要依靠从粪便、痰、尿或脑积液中检获幼虫
在三轴仪中进行固结不排水抗剪强度试验,当试样受到的周围固结压力σ3大于它曾经受到
除另有规定外,应在2h内全部溶散的丸剂是A.糊丸 B.滴丸 C.小蜜丸
最新回复
(
0
)