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活动系统
tech. dynamic system; dynamical system
活动系统: 62 phrases in 21 subjects
Agriculture1
Air defense3
Automobiles1
Aviation14
Communications1
Drilling1
Electronics7
Finances1
Fishery fishing industry1
General1
Information technology2
Mechanics1
Metallurgy1
Name of organization4
Nautical2
Project management1
Space7
Technology8
Telecommunications1
United Nations3
Water resources1