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| 最初采收率; 原始回收率 | |||
| 一次开采 | |||
| 一次回收率; 一次采油; 最初回收率; 首次可采销量; 初次开采 | |||
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| 一次釆油 | |||
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primary recovery : 9 phrases in 4 subjects |
| Mining | 2 |
| Oil / petroleum | 4 |
| Space | 1 |
| Technology | 2 |
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