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operation field
met.	操作字段
tech.	指令字段

operation field: 36 phrases in 18 subjects

Agriculture	3
Aviation	3
Bridge construction	1
Business	1
Corporate governance	2
Cryptography	1
Earth sciences	1
Economy	1
Explosives and Explosive Ordnance Disposal	2
Geophysics	1
Mining	1
Name of organization	1
Nursing	1
Oil / petroleum	1
Space	4
Technology	10
United Nations	1
Veterinary medicine	1