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| 乙类电话公司传统的有线市话公司，以 FCC B Block 频段经营蜂窝个人通信业务 | |||
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B carrier : 6 phrases in 5 subjects |
| Computer networks | 1 |
| Economy | 1 |
| Information technology | 1 |
| Nautical | 2 |
| Textile industry | 1 |
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