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главная валентность stresses
chem.	ordinary valence; primary valence; primary valency
el.chem.	main valency
Makarov.	principal valence; principal valency; ordinary valency; chief valency; normal valency
tech.	chief valence; normal valence

главная валентность: 7 phrases in 4 subjects

Chemistry	3
Makarov	1
Oil and gas	1
Technology	2