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| 光学千分表 | |||
| 光率体 | |||
| 光折射椭球; 光学特性曲线 | |||
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| 光折射椭球; 光学特性曲线 | |||
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optical indicatrix : 11 phrases in 2 subjects |
| Oil / petroleum | 1 |
| Technology | 10 |
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