体积寿命
White light-emitting diodes ( LED) have been called as the fourth generation solid-state lighting source due to their small volume, energy-saving, environment-friendly, and long lifetime.
白光LED具有体积小、节能、环保、寿命长等优点,被称为第四代照明光源。
英语网 · 双语新闻
英语网 · 双语娱乐资讯
英语网 · 少儿英语故事