photocell
(1)光电池
(2)光电管
(3)光电元件

• rejuvenation
• rel
• related function
• related point
• relation
• relation density
• relationship
• relative
• relative accuracy
• relative aperture
• relative brightness
• relative directional efficiency
• relative dispersion
• relative error
• relative exposure
• relative humidity
• relative illumination
• relative index of refraction
• relative luminosity
• relative luminosity factor
• relative luminous efficiency
• relative measurement
• relative motion
• relative opening
• relative parallax