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转换通道; 切换通道 |
switching channel : 40 phrases in 12 subjects |
Air defense | 1 |
Aviation | 2 |
Communications | 1 |
Electric machinery | 1 |
Electronics | 16 |
Information technology | 3 |
Project management | 1 |
Rail transport | 1 |
Shipbuilding | 2 |
Space | 2 |
Technology | 6 |
Telecommunications | 4 |