前几日提供给老外一个活塞样品,今日回了结果,其中要求提供一些资料,原文为: * R9 O5 R! O( v. E/ n& p8 G F$ ATo cooperate with you further we need the next information: 5 B: C9 t, N. i- material name and material properties of the pistons, the material certificate DIN;) E1 a" k$ G% l) D. r7 q2 e: a
请问最后一句the material certificate DIN中的DIN在这里是何义?(不要告诉我是德国工业标准的简称或缩写哦 )/ `! n' s4 F" Y' K& {