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| diaphragm aperture | |||
| aperture of diaphragm; diaphragm opening; iris aperture | |||
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光阑孔径 : 13 phrases in 7 subjects |
| Air defense | 2 |
| Construction | 1 |
| Earth sciences | 1 |
| Electronics | 1 |
| Metallurgy | 2 |
| Space | 2 |
| Technology | 4 |
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