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bottom layer | |||
sub-pavement; underlying bed; underbed; subjacent bed; sub-armour | |||
underlayer; base layer; lower stratum | |||
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low layer |
couche inférieure: 17 phrases in 6 subjects |
Communications | 9 |
Earth sciences | 1 |
General | 2 |
Metallurgy | 3 |
Telecommunications | 1 |
Transport | 1 |