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system of units
chem.	układ jednostek (miar)
comp., MS	układ jednostek miar (A set of units used for measurement or exchange)
metrol.	układ jednostek
English thesaurus
International System of Units
energ.ind., abbr.	SI
System of Units
abbr.	SI

system of units: 4 phrases in 3 subjects

Metrology	2
Politics	1
Technology	1