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| effective life time | |||
| service life | |||
| actual life | |||
| active life; effective life (time); useful life (span) | |||
| active life time | |||
| useful life; useful life component | |||
| available life; effective life; effective lifetime; useful time | |||
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| useful life span | |||
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| useful life | |||
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| effective life | |||
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| useful life | |||
| 有 效寿命: 13 phrases in 9 subjects |
| Aviation | 1 |
| Business | 2 |
| Commerce | 1 |
| Drilling | 1 |
| Metallurgy | 1 |
| Oil processing plants | 1 |
| Space | 2 |
| Technology | 3 |
| Wind Energy | 1 |
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