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Meaning of R99 | Babel Free

Noun CEFR A2

Definitions

R99; Ellipsis of NIOSH R99.
uncountable
R99 standard
uncountable
R99 filter
countable

CEFR level

A2

Elementary
This word is part of the CEFR A2 vocabulary — elementary level.

See also

Ra ra'y RAA Raab Raabe RAAC