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随便看	optical cavity optical center optical centre optical character reader optical character recognition optical comparator optical dating optical density optical disc optical disk optical double optical drive optical fibre optical fibres optical flat optical glass optical illusion optical illusions optical indicatrix optical isomer optical isomerism optical isomerism opticality optical lattice optical length 𮔊𮖁𮖁裆𮖱𮙊𮙋𮝴𮝵𮝸𮝹 Primärkabelklemme Primärkollision Primärkosten Primärkreis Primärleitung Primärluft Primärluftdruck Primärluftleitung Primärluftmenge Primärluftstrom