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| extrados, back of a vault; extrados, line of the extrados; back; extrados (of a vault) | |||
| suction face | |||
| passive surface; upper surface of the wing | |||
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extrados : 23 phrases, 4 sujets |
| Construction | 7 |
| Général | 1 |
| Structures de construction | 1 |
| Transport | 14 |