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| optical mark recognition | |||
| optic character recognition; optical character recognition | |||
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| optical mark recognition | |||
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光 标 识别 : 29 phrases in 9 subjects |
| Agriculture | 1 |
| Air defense | 2 |
| Aviation | 9 |
| Chemistry | 1 |
| Electronics | 8 |
| General | 1 |
| Military | 1 |
| Space | 5 |
| Telecommunications | 1 |
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