[题目]太阳能是取之不尽的清洁能源,越来越受到人们的重视。太阳能热水器作为一种成熟的产品已在千家万户普遍使用。有两根玻璃真空管,一根为简易太阳能真空集热管(镀黑),另一根为普通真空集热管,用量杯各倒入200毫升水,经灯光同时照射一段时间后,用数字温度计观察温度,可以观察到镀黑的 [Topic] Solar energy is an inexhaustible source of clean energy that has received increasing attention from people. As a mature product, solar water heaters have been widely used in millions of households. There are two glass vacuum tubes, one is a simple solar vacuum tube (black plating), the other is an ordinary vacuum tube, the amount of each poured into 200 ml of water, after a period of time by the light exposure, with a digital thermometer to observe the temperature , can be observed black