一键复制
在日常学习、工作或生活中，大家总少不了接触作文或者范文吧，通过文章可以把我们那些零零散散的思想，聚集在一块。那么我们该如何写一篇较为完美的范文呢？接下来小编就给大家介绍一下优秀的范文该怎么写，我们一起来看一看吧。
净化水质翻译篇一
- 暑假英语作文 推荐度：
- 中考英语作文 推荐度：
- 友谊的英语作文 推荐度：
- 创新的英语作文 推荐度：
- 爱的英语作文 推荐度：
- 相关推荐
水的净化(water purification)
the provision of safe water necessitates one of the rnajor expenditures of manpower and revenue in our modern cities. the purification of water is basically a two-step or three-step process carried out under the strict supervision of public health scientists and engineers. as the first step, natural water from the least contaminated source is allowed to stand in large reservoirs, where most of the mud, clay, and silt settle out; this is called "sedimentation". often in water with high mud content, lime and aluminum sulfate are added to the water in the settling reservoirs. these chemicals react in the water to form aluminum hydroxide, which settles slowly and carries much of the suspended material, including most of carries much of the suspended material, including most of the bacteria, to the bottom of the reservoirs. as the second step, the water is filtered through beds of sand and grovel, which remove other impurities and chemicals in it. during or after filtration, chemicals are ordinarily added to the water to kill any remaining harmful bacteria. chlorine is one of the most common chemicals used for this purpose. a third step taken by some rmnicipalities is adding to the water other beneficial chemicals such as fluoride to make tooth enamel hard, and soda ash to make the water itself soft. the water purification process, carried out with little variation from one large city to another, is perhaps the biggest factor in the prevention of major outbreaks of disease in this country.
s("content_relate");【水的净化英语作文】相关文章：
《水的净化》教案12-07《水的净化》的化学教学反思03-15水的净化课堂小学教案09-22《水的净化》教学设计（精选6篇）06-28水的净化教学设计（精选5篇）05-29中考化学《水的净化》知识点02-22《水的净化》教学反思及总结（精选5篇）11-20关于水的净化的基础化学知识点07-13水英语作文12-23
