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| 数值孔〔口〕径计; 物镜口径计; 开角机 | |||
| 孔径测量计; 孔径计 | |||
| 数值口径计; 数值孔径计; 孔径仪 | |||
| apertometer: 4 phrases in 1 subject |
| Technology | 4 |
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