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| 煤心采取率指某一段孔深内采取的煤心长度与该段煤层进尺之比，或采取的煤心质量与钻进煤层应有的煤心质量之比，用百分数表示 | |||
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coal core recovery : 1 phrase in 1 subject |
| Technology | 1 |
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