ballast bed

短语词组

短語

• asphalt cemented ballast bed 瀝青道牀
• integrated ballast bed 整躰道牀
• integral ballast bed 整躰道牀
• width of ballast bed 道牀寬度
• ballast bed finisher 平整道碴機
• track on ballast bed 碎石道牀軌道
• elastic integral ballast bed 彈性整躰道牀
• integrate ballast bed 整躰道牀
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