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| 51. | alarm apparatus |
| 警报器 |
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| 52. | monitored alarm |
| 中央控制警钟 |
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| 53. | meteorological alarm |
| 气象报警器 |
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| 54. | alarm thermostat |
| 恒温报警器 |
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| 55. | radiation alarm |
| 辐射警报信号 |
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| 56. | automatic alarm |
| 自动警报器;自动报警器 |
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| 57. | threshold alarm |
| 阚值告警 |
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| 58. | alarm mainspring |
| 闹钟发条 |
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| 59. | stability alarm |
| 稳定度警报 |
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| 60. | annunciator alarm |
| 警报信号器 |
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