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| 技术参考资料 | |||
| 技术参考文献 | |||
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| TR | |||
| TR (Bell, Telephony) | |||
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Technical Reference : 7 phrases in 6 subjects |
| Aviation | 2 |
| Cryptography | 1 |
| Earth sciences | 1 |
| Economy | 1 |
| Electronics | 1 |
| United Nations | 1 |
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