题目内容
水锤压力实际上是由于水流速度变化而产生的（ ）。
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由于负荷的变化而引起导水叶开度、水轮机流量、水头、机组转速的变化，称为水电站的不稳定工况。
水锤波在传播过程中，外部条件发生变化处不会发生反射和折射。
间接水锤是水电站中经常发生的水锤现象。
Direction: Please fill in the following blanks according to the above video you have finished watching.China is one of the largest countries in the world, and both fast1of land, a large population and a long history. China has a wide2of languages, customs and cultures, and there are often different customs3in northern and southern regions. Most of China's customs4around agriculture, while other festivals5the legends of well known people. Now for example, the dragon Boat Festival6 China's Chuyang, a great patriotic poet who lived in the Zhanguo dynasty around 2300 years ago. People in the South celebrate this legend by making Zongzi wearing pomegranate and7dragon boat races. Some customs practiced by8groups such as wrestling and horse racing in a Mongolia 9local holidays. There are some customs that are the same throughout China, such as eating dumplings, 10fireworks and wishing each other a happy new year during the spring festival.
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