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【简答题】

Directions: Read the following passage. Fill in the numbered blanks by using the information from the passage. Write NO MORE THAN THREE WORDS for each answer. Since the earliest civilizations, people have controlled rivers to meet society's demands. Today, rivers are controlled for many reasons, primarily to maintain reliable water supplies for daily, agricultural and industrial needs, for power generation, for navigation (航行), and to pr flooding. River control is achieved by channelization, a term that covers a range of river engineering works, including widening, deepening, straightening and stabilization of banks, and by the construction of dams. An important period of channelization took place in Europe during the 19th century, when many large rivers were straightened and their beds deepened. One of the most dramatically changed was the Tisza River, a branch of the Danube that flows through Hungary. The controlling of the Tisza, designed to reduce flooding and make land for agriculture, included cutting off more than 100 meanders (河曲), shortening the river's length by nearly 400 kilometers. One of the most common ways in which people control rivers is by damming them. The past 50 years or so has seen an increase in dam construction worldwide, and at the beginning of the 21st century, there were about 800,000 dams globally, some towering more than 200 meters in height. Despite their successes, many dams also cause significant environmental changes that prove harmful. Some particularly deep reservoirs (水库) can bring about earthquakes due to the stress on their bottom rocks caused by huge volumes of water. Downstream of a reservoir, the river is certainly influenced in many ways:water volume, speed and quality are all affected, leading to changes in the landscape and among plants and animals.

题目标签:水库河曲航行
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刷刷题刷刷变学霸
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【单选题】以下哪个水库不属于北京五大水库之一()。

A.
密云水库
B.
怀柔水库
C.
十三陵水库
D.
斋堂水库
E.
海子水库
F.
官厅水库

【单选题】水库诱发地震描述正确的( )

A.
水库蓄水而导致库区地震活动有减弱的现象
B.
水库蓄水而导致库区地震活动显著增强 ( 强度或频度增加 ) 的现象。
C.
水库蓄水而导致地震活动显著增强变化的现象。
D.
水库蓄水而导致库区地震活动基本不变的现象

【多选题】一艘航行于内河的45m客船,关于驾驶室安装的电动舵角指示器,下列叙述正确的有哪些()

A.
舵角指示装置应由独立分路供电
B.
舵角指示装置与实际舵角的误差精度应不大于1.5度
C.
舵角指示装置与实际舵角的误差精度应不大于1度
D.
驾驶室的舵角指示装置应有亮度可调的照明灯或夜光刻度

【单选题】沿岸航行,大船的航线应设计在()。

A.
10m等深线以外
B.
20m等深线以外
C.
水深大于2倍于本船吃水的海区
D.
B、C中水深较深的海区

【单选题】船舶沿岸航行时,计划航线应拟定在()。

A.
10米等深线以内
B.
离岸10海里之外
C.
水深的2倍以上
D.
离岸3海里以上