phototimer
(1)曝光计
(2)摄影计时器
(3)延时光控继电器

• electrolyte electroreflectance
• electrolyte solution
• electrolytic
• electrolytic bath
• electrolytic image transducer
• electrolytic phtocell
• electrolytic polishing
• electrolytic solution
• electrolyzer
• electromagentic field
• electromagentic ligth value
• electromagentic radiation
• electromagentic resonance
• electromagentics
• electromagentic spectrum
• electromagentic tele-communication
• electromagentic theory of light
• electromagentic wave
• electromagentism
• electromagnetic clutch
• electromagnetic contactor
• electromagnetic field intensity
• electromagnetic mode
• electromagnetic mode interaction
• electromechanical