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| C-14 age method | |||
| 测年法: 110 phrases in 10 subjects |
| Agriculture | 1 |
| Chemistry | 1 |
| Desert science | 10 |
| Earth sciences | 3 |
| Ecology | 2 |
| Engineering geology | 2 |
| General | 2 |
| Human resources | 1 |
| Oil / petroleum | 23 |
| Technology | 65 |
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