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| second difference | |||
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二 次 差 : 21 phrases in 9 subjects |
| Animal husbandry | 1 |
| Aviation | 1 |
| Business | 2 |
| Earth sciences | 3 |
| Economy | 1 |
| Electronics | 3 |
| Quality control and standards | 1 |
| Technology | 7 |
| Telecommunications | 2 |
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