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| 柔性降级 | |||
| 个别部件发生故障时工作可靠但性能下降; 适度恶化; 故障的弱化; 软故障 | |||
| 故障软化; 工作性能下降 | |||
| 故障弱化; 缓慢降级 | |||
| 机件故障降级操作; 适度退化 | |||
| 舒缓退化; 降级运行发生故障，仍能工作，但性能下降 | |||
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