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σ-type model
genet.	σ 式模型

type model : 42 phrases in 16 subjects

Automobiles	1
Aviation	4
Biotechnology	2
Bridge construction	1
Business	5
Corporate governance	1
Genetics	2
Information technology	1
Mathematics	4
Mechanic engineering	1
Mechanics	1
Oil / petroleum	2
Physics	1
Statistics	4
Technology	11
Textile industry	1