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| 高层业务; 高级勤务 | |||
| 高级业务如 ATM, DDN,FR,PS 等业务 | |||
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| 高级业务如 ATM, DDN,FR,PS 等业务 | |||
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higher level service : 5 phrases in 4 subjects |
| Electronics | 1 |
| General | 1 |
| Space | 1 |
| Telecommunications | 2 |
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