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安全 证书 : 41 phrases in 9 subjects |
| Air defense | 1 |
| Communications | 1 |
| Economy | 1 |
| Exhibitions | 1 |
| Logistics | 1 |
| Nautical | 13 |
| Shipbuilding | 5 |
| Technology | 17 |
| Textile industry | 1 |
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