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operational time
busin. 运转时间
el.mach. 动作时间; 运行时间
tech. 操作时间
operational time: 22 phrases in 13 subjects
Air defense2
Automobiles1
Earth sciences1
Economy1
Electric machinery2
Electronics1
Metallurgy1
Oil / petroleum1
Oil processing plants1
Shipbuilding2
Space2
Technology5
Telecommunications2