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| внутреннее кольцевое пространство (The "A" annulus is the void between the production tubing and the smallest casing string. (wiki) Alexander Demidov) | |||
| A annulus: 7 phrases in 4 subjects |
| Electrical engineering | 1 |
| General | 2 |
| Makarov | 2 |
| Medical appliances | 2 |