Through metallograghy SEM and TEM observation the initiation and propagation mechanism of cracks in cold-drawing of 72A hard wire was analyzed.是什么意思_Through metallograghy SEM and TEM observation the initiation and propagation mechanism of cracks in cold-drawing of 72A hard wire was analyzed.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句