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| 无结构镜质麻 | |||
| 无结构腐殖体 | |||
| 无结构凝胶体 | |||
| 无结构镜质体; 无结构凝胶质 | |||
| 凝胶煤素质 | |||
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collinite : 6 phrases in 2 subjects |
| Oil / petroleum | 2 |
| Technology | 4 |
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