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| 阶段抽样 | |||
| stage sampling: 49 phrases in 11 subjects |
| Agriculture | 1 |
| Animal husbandry | 1 |
| Business | 6 |
| Desert science | 2 |
| Economy | 1 |
| Genetics | 1 |
| Marketing | 1 |
| Mathematics | 6 |
| Space | 1 |
| Statistics | 17 |
| Technology | 12 |
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