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道床结构
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道床结构
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道床结构
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track bed structure
道床结构
铺设于路基、桥梁或隧道结构之上,钢轨、轨枕之下及周边的碎石、卵石层或钢筋混凝土层。是轨道重要组成部分,轨道框架的基础。
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The Allegory of Good and Bad Government
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the analysis of variable rules
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