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安 全 因数 : 10 phrases in 10 subjects |
| Aviation | 1 |
| Business | 1 |
| Earth sciences | 1 |
| Electric machinery | 1 |
| Electronics | 1 |
| Information technology | 1 |
| Lighting other than cinema | 1 |
| Nautical | 1 |
| Space | 1 |
| Technology | 1 |
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