
Mechanical pencils for technical drawings - Part 1: Classification, dimensions, performance requirements and testing (ISO 9177-1:2016, IDT)
出版:Standardiserings-Kommissionen I Sverige

專家解讀視頻
Mechanical pencils for technical drawings - Part 1: Classification, dimensions, performance requirements and testing (ISO 9177-1:2016, IDT)
出版:Standardiserings-Kommissionen I Sverige
專家解讀視頻