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| A annulus (The "A" annulus is the void between the production tubing and the smallest casing string. (wiki) Alexander Demidov) | |||
| внутреннее кольцевое пространство: 4 phrases in 3 subjects |
| Astronautics | 1 |
| Drilling | 1 |
| Oil / petroleum | 2 |
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| |||
| A annulus (The "A" annulus is the void between the production tubing and the smallest casing string. (wiki) Alexander Demidov) | |||
| внутреннее кольцевое пространство: 4 phrases in 3 subjects |
| Astronautics | 1 |
| Drilling | 1 |
| Oil / petroleum | 2 |