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selective system
tech.	选择系统

selective system : 37 phrases in 17 subjects

Agriculture	1
Animal husbandry	1
Automobiles	1
Aviation	5
Chemistry	1
Commerce	1
Communications	1
Drilling	1
Electronics	5
Finances	1
Law	3
Mineralogy	1
Mining	1
Nautical	1
Navigation	2
Technology	9
Telecommunications	2