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| 主报警信号; 主警报装置 | |||
| 主报警信号 (signal) | |||
| 主报警信号; 干线报警器 | |||
| 主报警器; 主报警 (信号器) | |||
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| 主报警信号 | |||
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main alarm : 6 phrases in 5 subjects |
| Communications | 1 |
| Nautical | 1 |
| Nuclear and fusion power | 1 |
| Shipbuilding | 2 |
| Technology | 1 |
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