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