
Mechanical pencils Part 2: Black leads - Classification and dimensions
出版:International Organization for Standardization

专家解读视频
BIS IS/ISO 9177-2:1989 (R2011) - Identical
SS ISO 9177-2 Ed. 1 (1996) - Identical
NEN ISO 9177-2:1990 - Identical
KS G ISO 9177-2:2002 - Identical
KS A ISO 9177-2:2007 - Identical
SANS 9177-2:1989 - Identical
DIN ISO 9177-2 (1990-03) - Identical
NF ISO 9177-2:1990 - Identical
UNI ISO 9177-2:1991 - Identical
UNE 1164-2:1996 - Identical