aloxite
(Al2O3)
(1)熔融氧化铝(人造刚玉磨料)
(2)铝砂

• observing ine
• obstacele avoidance laser system
• obstacle avoidance sensor
• obstruction
• obtainable accuracy
• obtuse
• obtuse angel
• occulation
• occulting disk
• occupancy
• occupied electron state
• occupied state
• occuption number
• ocean environment
• oceanography
• ocean optics
• ocellus
• ochre
• ocsillator strenght
• octagon
• octagonal prism
• octahedral
• octahedralcrystal
• octahedral structure
• octahedron