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train block system
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train block system
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train block system
行车闭塞法
通过相邻车站、线路所、闭塞分区的设备或人为控制,使列车与列车相互间保持一定时空间隔,以保证列车运行安全的行车方法。
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polyaramide fiber
polyaramide; polyarylamide; aromatic polyamide
polyarchy
polyare
polyarmide fiber
poly(aromatic sulfone) fiber
Poly Art Museum
polyarylamide
poly(aryl amide sulphone)
polyarylate
polyarylate fiber
polyarylene ether nitrile
poly (aryl ester)
poly (aryl ether)
polyaryletherketone
poly (aryl sulfone)
poly(arylsulfone)
polyarylsulfone fiber
poly (aryl sulfone) (PAS)
polyaspartic acid
polyatomic
polyatomic molecule
poly-automata
poly-automorphism
polyauxotroph
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