zánik Cítit se špatně Činidlo explain laser hruška Podnikatel Doplnění
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LASER BEAM What is LASER BEAM ? The term laser is an acronym for Light Amplification by Stimulated Emission of Radiation. A laser beam is a powerful, - ppt download
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Laser : Fundamentals - What is a laser?
LASER BEAM What is LASER BEAM ? The term laser is an acronym for Light Amplification by Stimulated Emission of Radiation. A laser beam is a powerful, - ppt download
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Laser light, explained by RP Photonics Encyclopedia; radiation, coherence, focusability, light pulses, hazards