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| 整群抽样; 逐次抽样检查; 顺序选取; 序贯抽样序列采样 | |||
| 按序存取 | |||
| последовательная выборка: 15 phrases in 5 subjects |
| Computers | 1 |
| General | 9 |
| Mathematics | 2 |
| Oil processing plants | 1 |
| Technology | 2 |
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