太阳能热水器通常把太阳能板安装在顶部.
1）为什么要用铜管?
因为铜管更易于导热：
For its good thermal conductivity
2）为什么铜管的和金属片是黑色的?
黑色有利于吸收热量.
Black pipes are easy to absorb heat.
3）为什么金属板下面要有隔热板?
防止热量从底部散去.
To reduce the energy loss from bottom
这题好怪啊,楼主是不是没把所有东西打出来啊?
（英文版的物理）Water heater that make use of the Sun often have sol
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