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| 投影器光度头 | |||
| 光学头; 光拾取头 | |||
| 光度头 | |||
| 光学头部 (姿态测量敏感器的) | |||
| 光盘头 | |||
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| 光度头 | |||
| optical head: 31 phrases in 4 subjects |
| Aviation | 3 |
| Electronics | 3 |
| Space | 3 |
| Technology | 22 |
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