1. LED, LCD ke eng? LED e emetse Light-Emitting Diode, sesebelisoa sa semiconductor se entsoeng ka metsoako e nang le likarolo tse kang Gallium (Ga), Arsenic (As), Phosphorus (P), le Nitrogen (N). Ha li-electrone li kopana hape le masoba, li hlahisa leseli le bonahalang, ho etsa hore li-LED li sebetse hantle haholo ha li fetola li...
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