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| |||
| manganese concretion | |||
| manganese nodule | |||
| halobolite | |||
| manganese module | |||
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锰 结 核 : 36 phrases in 6 subjects |
| Desert science | 2 |
| Earth sciences | 4 |
| Engineering geology | 1 |
| Metallurgy | 2 |
| Oil / petroleum | 2 |
| Technology | 25 |
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