用英文回答"水是如何在地球上出现的".还有"水对人类的意义".最好简短一点的...急用`
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用英文回答"水是如何在地球上出现的".还有"水对人类的意义".最好简短一点的...急用`
用英文回答"水是如何在地球上出现的".还有"水对人类的意义".
最好简短一点的...急用`
用英文回答"水是如何在地球上出现的".还有"水对人类的意义".最好简短一点的...急用`
Water (H2O) by hydrogen and oxygen two elements of minerals, under normal pressure at normal temperature for the transparent colorless and tasteless liquid. Water is the planet one of the most common substances, including human life, all the survival of important resources, but also organisms most important component. Water in the evolution of life has played an important role. Human very early start on the water had knowledge of the ancient things simple concept of the material put in the water as a basic component elements, water is one of the five elements in ancient China, the four ancient elements of the West also said there is water.
Water is an important resource for human life, especially in agriculture need plenty of water for irrigation, most of the origin of human civilization in the river basin. Early in the waterside town are generally set up to resolve irrigation, drinking and sewage problems. In human life, in drinking water, cleaning, washing, and so the role of an indispensable.
With the development of science and technology, people Xingxiu water conservancy, water and waterlogging and floods and other natural disasters to fight. Thus creating a number of special water-related research areas, such as water mechanical, hydrological sciences, water treatment, and even had a water-dependent industries aquaculture.
Industrial production and large-scale use of this chemical production of cheap raw materials. However, untreated wastewater discharge will cause any water pollution. In order to solve this problem, the sewage treatment has become very necessary.