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运转时间 | |||
动作时间; 运行时间 | |||
操作时间 |
operational time: 22 phrases in 13 subjects |
Air defense | 2 |
Automobiles | 1 |
Earth sciences | 1 |
Economy | 1 |
Electric machinery | 2 |
Electronics | 1 |
Metallurgy | 1 |
Oil / petroleum | 1 |
Oil processing plants | 1 |
Shipbuilding | 2 |
Space | 2 |
Technology | 5 |
Telecommunications | 2 |