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track bed structure
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track bed structure
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工学
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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urn sampling
Urn with human skull ashes
urobilin
urobilinogen
urocanase
Urochordata
urochordata
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urodeum
urodialysis
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urogenital aperture
urogenital apparatus
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urogenital sinus
urogenital system
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