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北部大平原
| 区域含水层
| 系统分析
| 北部大平原 | |
| earth.sc. | Northern Great Plains |
| 区域含水层 | |
| oil | regional aquifer |
| 系统分析 | |
| gen. | systems analysis |
| bridg.constr. | systematic analysis |
| commer. | systematical analysis |
| econ. | system analysis; the network analysis |
| el. | system analysis |
| environ. | systems analysis |
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| Northern Great Plains | |||
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北部大平原 : 3 phrases in 1 subject |
| Earth sciences | 3 |
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