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maintenance operation
auto.	维护作业
avia.	维护操作
railw.	维修养护作业
space	维修作业

maintenance operation: 153 phrases in 32 subjects

Agriculture	2
Air defense	2
Automobiles	2
Aviation	20
Business	4
Chemistry	1
Commerce	1
Communications	5
Computer networks	2
Computers	1
Earth sciences	3
Economy	10
Electronics	29
Exhibitions	1
Finances	1
General	2
Hydroelectric power stations	6
Information technology	6
International Monetary Fund	1
Management	1
Metallurgy	1
Military	1
Plastics	1
Project management	6
Rail transport	3
Shipbuilding	1
Space	4
Technology	18
Telecommunications	12
Textile industry	2
Water resources	2
Wind Energy	2