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| 分层; 间层; 附层; 薄层; 分裂 | |||
| 夹层; 开发小夹层; 层 | |||
| 插入层; 煤线 | |||
| 插人层 | |||
| 弱透水层 | |||
| пропласток: 11 phrases in 5 subjects |
| Drilling | 1 |
| General | 1 |
| Geology | 7 |
| Oil and gas technology | 1 |
| Technology | 1 |
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