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| 头部护具 | |||
| 井塔; 井架; 船首帆缆装置; 安全帽; 帽子; 头饰; 头盔; 钻塔 | |||
| head gear: 15 phrases in 6 subjects |
| Engineering geology | 1 |
| Nautical | 1 |
| Plastics | 1 |
| Shipbuilding | 1 |
| Technology | 9 |
| Telecommunications | 2 |
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