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有砟轨道
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有砟轨道
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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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environmental toxic chemicals
environmental toxicology
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Environment and Development Report of the People's Republic of China
environment and disaster monitoring satellite
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Environment and History
Environment and Plant Protection Institute,Chinese Academy of Tropical Agricultural Sciences
environment and resources court
environment and resources dispute
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