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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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commutative algebra
commutative-associative ring
commutative Banach algebra
commutative band
commutative binary composition
commutative center
commutative cochain
commutative composition
commutative convergence
commutative diagram
commutative elements
commutative extension
commutative field
commutative graded algebra
commutative group
commutative group object
commutative groupoid
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commutative half-algebra
commutative hypergroup
commutative identity
commutative lattice
commutative law
commutative law of addition
commutative law of multiplication
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