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| 防护性维护 | |||
| 定期检修; 定期维修保养 | |||
| 预防性维修 | |||
| 预防性维护; 定期修理 | |||
| English thesaurus | |||
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| PM | |||
| preventative maintenance: 2 phrases in 2 subjects |
| Aviation | 1 |
| Space | 1 |
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