DIN EN 15257 (2007-03)废止
Cathodic protection - Competence levels and certification of cathodic protection personnel
出版：German Institute for Standardisation (Deutsches Institut für Normung)
专家解读视频
SN EN 15257:2007 - Identical
BS EN 15257:2006 - Identical
NBN EN 15257:2007 - Identical
NF EN 15257:2007 - Identical
I.S. EN 15257:2006 - Identical
UNI EN 15257:2007 - Identical
NS EN 15257 Ed. 1 (2006) - Identical
SS EN 15257 Ed. 1 (2006) - Identical
NEN EN 15257:2007 - Identical
EN 15257:2006 - Identical
ONORM EN 15257:2007 - Identical
