光学平度

用途：用途：配合水平仪、光学平直仪、电子水平仪用来检测平板、平尺、机床工作台、导轨和精密工件的平面度。

optical null double-beam farinfrared spectrometer

a key national network of communications optical cables

head, optical with filters for movable information storage

optical path length【光】

optical journal reader【计】

Optical Microscopy

travelling-wave semiconductor optical amplifier

self-supporting optical fiber cable