ballast bed

短语词组

短语

• asphalt cemented ballast bed 沥青道床
• integrated ballast bed 整体道床
• integral ballast bed 整体道床
• width of ballast bed 道床宽度
• ballast bed finisher 平整道碴机
• track on ballast bed 碎石道床轨道
• elastic integral ballast bed 弹性整体道床
• integrate ballast bed 整体道床
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