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system efficiency
sol.pow.	系统的效率
wind.	系统效率

system efficiency : 43 phrases in 23 subjects

Agriculture	2
Aviation	3
Biotechnology	1
Business	2
China	1
Computers	1
Earth sciences	1
Electric machinery	1
Electricity	1
Electronics	2
General	1
Hydrology	2
Information technology	1
Management	2
Mechanics	1
Nautical	2
Project management	3
Refrigeration	1
Shipbuilding	2
Solar power	1
Space	3
Technology	8
Water resources	1