night aand day periscope
相关英语词汇推荐
- chronophotography
- metacrystalline
- astrospectrograph camera
- optical head controllers,control ics/modules
- mode pattern
- Varotal lens
- intensifying screen
- diatomic roto
- infra-red beam folower
- optical deformation
- filters
- time-averaged shadow-moire method
- multilongitudianl-mode laser
- visible emissivity
- frequency summing
- holographic gratings
- optical harmonic generation
- push out
- geometrical focus
- upper state relaxation