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| 填砾井; 砾石壁井 | |||
| 砾壁井; 砾石滤水井 | |||
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| 砾石充填井 | |||
| 砾壁井 | |||
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gravel-packed well : 3 phrases in 2 subjects |
| Oil / petroleum | 1 |
| Technology | 2 |
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