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| Bell Operating Company (Bell System 于 1984年解体后,脱离 AT&T 而各自独立的 22个地区贝尔电话营运公司) | |||
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贝尔营运公司 : 6 phrases in 3 subjects |
| Electronics | 2 |
| Multimedia | 1 |
| Telecommunications | 3 |
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