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[report整理] SENEWS-2011-04-25

提高英语听力能力 找对方法很重要!

[Homework]SENEWS-2011-04-25

This is the VOA English Technology report.Solar water heaters are used around the world and enough difficulty to build.The system will be going to describe is based on the design developed years ago in the strength. Since then, it has been built and used in many countries.It can heat 70 litters of wwater to 60 degrees It can do this between sunrise and noon on a clear day with the average air temperature of 32 degrees.There are two parts ...of the solar water heating.One parrt is made of sheet of metal painted black.Black surfaces become harder in the sun.Then surfaces painted in the other color.This black medal plate is called a collector.The collector is placed in contact with the water.There are several times of medal sheets that can be used for the collector....medal will work very well.....sheets are often used as roofs on housing.Once the water is heated, it is kept hot with isolation material.This allows the water to stay warm for a long holds the water for the system.This storage tank can be a container that holds about 100 litters tank.Two rubber pipes are retached to the water storage.One pipe lets water flow into the system.The other lets water flow out.When the water heater is working collector and back again.You can use the hot water as a top of the tank for washing and cleaning.You can change the flow of water so that the temperature is hot all warm as designed.This solar water heater is easy to build and uprite.It will last 2 years before the rubber pipes need to be replaced.These is also something else you will lead to make the solar water heater work.The sun,as you might imagine,the heater will heat water only on sunny days.You can get more informations about solar water heaters and other projects from interprise work wilder.This group works internationally to fight ...the website interprise work.cn.Choose the link for news and ...then click on publications and that's the VOA English Technology Report.Tell us if you have even built the solar water heater or have ideas for improvement.Post your comments at VOA Special English.com.Will you can also find ...MP3s, and ...of our programs.We also offer English teaching activities in the classroom section..
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