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electrosemaphore | |||
electrical signalling |
电 信号机 : 45 phrases in 12 subjects |
Agriculture | 1 |
Air defense | 1 |
Automobiles | 2 |
Aviation | 2 |
Business | 1 |
Communications | 5 |
Electric machinery | 2 |
Electronics | 5 |
General | 4 |
Management | 1 |
Rail transport | 1 |
Technology | 20 |