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砂质灰泥岩 : 12 phrases in 9 subjects |
| Bridge construction | 1 |
| Desert science | 1 |
| Drilling | 1 |
| Earth sciences | 1 |
| Engineering geology | 1 |
| General | 3 |
| Geology | 1 |
| Oil / petroleum | 1 |
| Technology | 2 |
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