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| interval sampling | |||
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间隔取样 : 16 phrases in 9 subjects |
| Automobiles | 1 |
| Drilling | 2 |
| Electronics | 1 |
| Engineering geology | 1 |
| Management | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 2 |
| Technology | 6 |
| Wind Energy | 1 |
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