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参考 式 : 16 phrases in 10 subjects |
| Agriculture | 1 |
| Aviation | 2 |
| Communications | 1 |
| Computer networks | 1 |
| Earth sciences | 1 |
| Electronics | 2 |
| Food service and catering | 1 |
| Space | 4 |
| Technology | 2 |
| Telecommunications | 1 |
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