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| 群系型 | |||
| 地层类型 | |||
| 生物群系型 | |||
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| 群系型 | |||
| 群丛型 | |||
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formation- type : 46 phrases in 6 subjects |
| Agriculture | 2 |
| Aviation | 1 |
| Drilling | 1 |
| Hydroelectric power stations | 1 |
| Oil / petroleum | 2 |
| Technology | 39 |
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