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| 年度维修保养 | |||
| 年度养护; 全年维修 | |||
| 年度保养; 年度维修 | |||
| 年度维护; 年度检修; 岁修 | |||
| yearly maintenance: 4 phrases in 2 subjects |
| Drilling | 2 |
| Technology | 2 |
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