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| service activity; servicing action | |||
| service activities | |||
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服务活动 : 21 phrases in 8 subjects |
| Aviation | 4 |
| Business | 1 |
| Computer networks | 5 |
| Earth sciences | 1 |
| Information technology | 4 |
| Multimedia | 2 |
| Space | 3 |
| Technology | 1 |
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