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| 数字交换 | |||
| 直接数字交换 | |||
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| 数字交换机 | |||
| 数字开关 | |||
| 数字交换 | |||
| 数字接线器包括时分接线器与空分接线器 | |||
| 数字式开关 | |||
| digital switching: 89 phrases in 13 subjects |
| Agriculture | 1 |
| Aviation | 12 |
| Business | 1 |
| Computer networks | 1 |
| Earth sciences | 2 |
| Electronics | 47 |
| General | 1 |
| Geophysics | 1 |
| Information technology | 4 |
| Rail transport | 1 |
| Space | 4 |
| Technology | 3 |
| Telecommunications | 11 |
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