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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

HOMEWORK 2016.12.24 40min
This is voa special English technology report.Solar water heaters are used around the world and are not very difficult to bulid.The system we are going to describe is based on the desire, the develop some use ago in XXX,since then it has been bulit and used in many countries.It can heat 70 liters of water to 60 degree XXX.It can do this between son rise and noon on the clear day with average air temperature of 32 degree XXX. There are two parts in solar water heater. One part is made of XXX of metal painted black.Black become hoter in the son then painted in the other colour.This black metal plate is called a collector. the collector is placed in contact with the water.There are several times of metal that can be used for the collectors. XXX work very well. XXX often used as wop on the housing.Once the water is heated , it is capted hot with isolation material.This allows the water stay warm for a long time.The second part of the solar water heater holds the water for the system.the storage tank can be a container that holds about 100 liters.Two XXX are touched to water storage tank.One pipe let water flow into the system, the other lets water flow out.When the water heating is working correctly, water wil flow from the storage tank to the collector and back again. You can use the hot water at the top of tank for washing and cleaning.you can change the flow of water so the temperature is hot or warm as XXX.This solar water heater is eaisy to build and uprate.It lasts about 2 years before the XXX pipes need to be replaced.there was also something else you will need to make solar water heater work.the son as you might imagin, the heater will heat water only on sonny days.
You can get more information about solar water heaters and the other project from enterprise works XXX.this group works internationally to fight povery.the webside is enterprise works XXX. Choose the link for news and resources then click on the publications.
And that is voa special technology report. Tell us if you ever built solar water heater or have ideas of improvements.Post your comments at voa special english.com or you can also find mp3 and pub to xxx.We also offer english teaching activities in the classroom section of our site. I'm STEVEN member.

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