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| 恒定失效时期 | |||
| 常故障期 | |||
| constant failure period: 13 phrases in 8 subjects |
| Automobiles | 2 |
| Aviation | 1 |
| Electronics | 1 |
| Management | 1 |
| Reliability | 2 |
| Space | 3 |
| Technology | 1 |
| Telecommunications | 2 |
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