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有砟轨道
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有砟轨道
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[轨道型式]
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ballast track
有砟轨道
由钢轨、扣件、轨枕和散粒体碎石(或卵石、砂)道床、道岔及轨道加强设备组成的铁路轨道。是铁路上应用最早、使用范围最广的轨道结构形式,有较丰富的使用经验,成套的线路大修、维修机械和施工工艺。
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Social Theory and Social Structure
social transaction
social transfers in kind
social transformation
social transformation of China's mega city-regions
Social transportization
social treatment
social tuning
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Social Value of the Arts
social variable
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social variety
social view of Chinese landscape architecture
Social War
social water cycle
Social Welfare
Social Welfare Enterprise
social welfare facilities
social welfare for the disabled
social welfare law
Social Welfare Management Engineering
social welfare policy
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