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转/小时 : 23 phrases in 10 subjects |
| Agriculture | 1 |
| Automobiles | 4 |
| Aviation | 3 |
| Business | 1 |
| Drilling | 2 |
| Earth sciences | 1 |
| General | 2 |
| Mechanics | 3 |
| Nautical | 1 |
| Technology | 5 |
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