N99

名词 n.

英文释义

名词 n.
  1. N99; Ellipsis of NIOSH N99.; N99 standard uncountable
  2. N99; Ellipsis of NIOSH N99.; N99 filter countable

词形变化

N99s plural

词汇关系

相关词
R95 P95
并列词
R99 P99 (99% filtration) R100 P100 N100 (99.97% filtration)

词源

From Initialism of Not resistant to oil particles with 99% filtration efficiency in NIOSH air filtration ratings.
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