2. 外语
  3. The Solar Water Heater Solar water heaters are used around the world and are not very difficult to build. / The system is ba

The Solar Water Heater Solar water heaters are used around the world and are not very difficult to build. / The system is ba

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答案 The Solar Water Heater Solar water heaters are used around the world and are not very difficult to build. / The system is based on a design developed some years ago. / It can heat seventy liters of water to sixty degrees Celsius. / It can do this between sunrise and noon on a clear day / with an average air temperature of thirty-two degrees Celsius. / There are two parts to the solar water heater. / One part is made of a sheet of metal painted black. / Black surfaces become hotter in the sun than surfaces painted any other color. / The second part of the solar water heater holds the water for the system. / This storage tank can be a container that holds about one hundred liters. / Two rubber pipes are attached to the water storage tank. / One pipe lets water flow into the system. / The other lets water flow out. / The solar water heater will last about two years / before the rubber pipes need to be replaced. /
解析     太阳能热水器
   世界各地都在使用太阳能热水器，且这种热水器建造起来并不难。这种太阳能热水器由两个部分组成。一个部分由漆成黑色的金属薄片制成。在阳光照射下，黑色的表面比漆成其他颜色的表面更容易吸收热量。太阳能热水器的第二个部分用来给系统储水。这个储水箱可以容纳100升水。有两条橡胶管连接到储水箱上，一条是进水管，另外一条是出水管。
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