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| poll | |||
| 头 顶 部: 26 phrases in 8 subjects |
| Architecture | 2 |
| Drilling | 7 |
| Earth sciences | 1 |
| General | 3 |
| Metallurgy | 1 |
| Oil / petroleum | 7 |
| Pest control | 1 |
| Technology | 4 |
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