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| ультразвуковая линия задержки с многократными отражениями | |||
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guided line : 18 phrases in 6 subjects |
| Construction | 1 |
| Drilling | 1 |
| Military | 5 |
| Occupational health & safety | 1 |
| Oil / petroleum | 8 |
| Oilfields | 2 |
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