R99

名词 n.

英文释义

名词 n.
  1. R99; Ellipsis of NIOSH R99.; R99 standard uncountable
  2. R99; Ellipsis of NIOSH R99.; R99 filter countable

词形变化

R99s plural

词汇关系

相关词
N99 P99
并列词
R100 P100 N100 (99.97% filtration)

词源

From Initialism of Resistant to oil particles with 99% filtration efficiency in NIOSH air filtration ratings.
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