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primary standard
anal.chem.	primäre Urtitersubstanz (in titrimetric analysis)
chem.	Normallösung f
opt.	Urmaß n; Urnormal n
phys.	Primärstandard m
tech.	Primärnorm f; Primärnormal n; Hauptnormal n
Primary Standard
el.	Hauptnormal n; Primärnormal n
Primary Standards
el.	Standard-Pufferlösungen m

primary standard: 14 phrases in 7 subjects

Earth sciences	1
Electronics	5
Lighting other than cinema	1
Optics branch of physics	2
Physics	1
Technology	3
Радиоактивное излучение	1