GLASS MAKING
17
1,save energy 2,environment protection 3,small and power
18
1,beautiful and colorful 2,energy saving=money saving 3,high safety
19
clothes
庞彦红efficientblueledpartoneledparttwopartthreepartfourefficientblueledfrom1907itwasdiscoveredthatasemiconductormaterialcanshineafterpowerwhichleadtobirthofhighbrightnessledlamptherapiddevelopmentofledlightingtechnologyhasbroughtgreatchangesfortopeople?slivesaboutledtheintroductionleddevelopmentonetwothreemonochromaticlightleditsdevelopmenthistorycompositelightledrapiddevelopmentwhiteledmonochromaticlightledmonochromaticlightleditsdevelopmenthistoryearlymonochromaticlightled1960swhichonlyglowredbymid70sthatcangreenyelloewandorangeearly80sbrighenessgreatlyenhancedcompositelightledledfromredblueledledwhiteledthroughthreestagesredmonochromatic单色led