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первичный эталон stresses
anal.chem.	primäre Urtitersubstanz
el.	Primärnormal n
mech.eng.	Urnormal n
med.appl.	Hauptnormal n
radio	Eichmaß n
tech.	Urnormale f
первичный световой эталон
opt.	Primärnormal n

первичный эталон: 4 phrases in 4 subjects

Construction	1
Metrology	1
Optics branch of physics	1
Technology	1