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| 内孔表面〔光学孔径，光学缺陷〕 检査仪 | |||
| 内孔表面光学孔径检查仪 | |||
| 内孔窥视仪; 检孔镜; 钢管内壁检查镜 | |||
| 内孔表面检查仪 | |||
| 内径表面检查仪 | |||
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boroscope : 3 phrases in 2 subjects |
| Metallurgy | 1 |
| Technology | 2 |
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