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理想液体是指
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液压系统中的工作压力取决于()
执行元件的运动速度取决于()
在研究流动液体时,把假设既()又无粘性的液体称为理想液体
Complete the following passage with the words and expressions from Reading 1.For many people, water has never been a big problem in their lives, which makes it very difficult for people to the preciousness of water. However, living creatures cannot live without water.On earth, less than 3% of water is fresh water, and the most of this is not easily . Besides, many factors have caused a major upset in the flow and use of fresh water and have caused major in many different places. This means if we don’t do anything to and use water wisely, all regions will begin to suffer from water crises one day and people’s life will be deeply affected in various perspectives.The effects of water can be seen in four broad areas. Drinking water leads to water-borne diseases that people die of. Lack of water needed for agriculture and causes lower of crops. In many parts of the world, children have to walk far to get water, and some of them have to miss school as a result. Lack of water also affects manufacturing, farming and mining, which results in constant .To solve the water problem, there is something we can do. We should be aware of the water crises; take part in competitions, organizations and societies that aim to preserve and water, use water wisely and save water whenever we can do it.
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