optical reflector
(1)反光镜
(2)光反射器

• sequential system
• serial
• serial air-survey camera
• serial coding
• serial correlation
• serialograph
• serial plate camera
• series
• series circuit
• series expansion
• series feed
• series motor
• series of spectral lines
• series-parallel
• series register
• series spectrum
• series triggering
• series winding
• series wound dynamo
• serration
• serration plug ga(u)ge
• serviceability
• service life
• service manual
• servoamplifier