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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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Light Green Plum
Light Green Propitious Cotton Robe of Emperor Qianlong's Concubine
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light guided probe chemical synthesis
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Lighthill method
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Lighthouse Buildings in Qingzhou
lighthouse effect
light hydrocarbon aromatization
light hydrocarbon dehydrogenation technology
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