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| 服务活动 | |||
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| 服务活动 | |||
| 服務活動 (A schedulable appointment to provide a service to a customer. A service activity uses one or more resources to perform a service at a specific time and place) | |||
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service activities : 3 phrases in 3 subjects |
| Aviation | 1 |
| China | 1 |
| Earth sciences | 1 |
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