引用第9楼H-RH于2008-02-25 00:06发表的 : # b: U7 P# Y- y. k" \ISO 4850:1979 * W* G6 S6 {3 e' @9 E, k5 j0 XPersonal eye-protectors for welding and related techniques - 3 P9 C& R! X& HFilters - * n4 r8 Z/ G7 c Utilisation and transmittance requirements