Samstag, 18. Dezember 2010

SIE













1 Kommentar:

  1. Anonym6. April 2013 um 08:49

    LEDs, first developed in the early 1960s, produce light by moving electrons through a
    semiconductor. Implementation of solar energy has environmental costs
    that may hamper its application on large-scale
    operations to reduce its impact. The LED light provides more light and less energy use.


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