electrotechnics
(1)学工学
(2)电工技术

• optical beam addressable storage
• optical beam expander
• optical beam flying
• optical beam splitter
• optical bench
• optical benches
• optical bevel portractor
• optical boroscope
• optical cable
• optical calculating machine
• optical calculation
• optical caliper
• optical cavity
• optical cavity mode
• optical cement
• optical cements and adhesives
• optical centre
• optical ceramics
• optical channel
• optical characteristics
• optical character reader
• optical character recognition equipment (OCR)
• Optical Character Recognition Equipment (OCR)
• optical charcter recognition machine
• optical choppers, mechanical modulators