manganese steel frog 中文意思是什麼
manganese steel frog
解釋
錳鋼轍岔-
Mechanism analysis of surface spalling of high manganese steel railway frog
高錳鋼鐵路轍叉表面龜裂剝落機理分析 -
Cast manganese steel frog
整鑄錳鋼轍叉
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