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| 自动防故障装置 | |||
| 故障时仍能安全运行的自动保护装置 | |||
| 失效安全保障装置 | |||
| 故障安全装置 | |||
| 防止事故装置; 安全保障装置 | |||
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| 故障保护的安全装置 | |||
| 故障保险装置 | |||
| 故障自动防护装置 | |||
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fail-safe device : 1 phrase in 1 subject |
| Drilling | 1 |
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