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| optical registration | |||
| optical recording | |||
| optic registration | |||
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光学记录 : 47 phrases in 9 subjects |
| Aviation | 5 |
| Earth sciences | 1 |
| Electronics | 12 |
| Geophysics | 2 |
| Missiles | 2 |
| Multimedia | 1 |
| Space | 7 |
| Technology | 16 |
| Telecommunications | 1 |
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