fixed ballast 中文意思是什麼
fixed ballast
解釋
固定壓載-
Railway fixed equipment. ballast and gravel for shovel - packing. characteristics and specifications
鐵路固定設備.道碴和礫石細料.特性和規范 -
Fixed railway installations. track service and maintenance tools. ballast grate
鐵路固定設備.鐵軌使用和維護用工具.道渣護柵
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