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探究性研究 : 17 phrases in 11 subjects |
| Aviation | 4 |
| Business | 1 |
| Earth sciences | 1 |
| Electronics | 1 |
| Geophysics | 1 |
| Marketing | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 2 |
| Plastics | 1 |
| Space | 1 |
| Technology | 3 |
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