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rescue train
救援列车
铁路线路上出现事故时,排除线路故障,起复机车和车辆,从而减少中断行车时间,恢复铁路安全畅通的列车。
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hexagonal close-packed structure HCP structure
hexagonal close packing
hexagonal closure condition
hexagonal crystal system
hexagonal dipyramid
hexagonal grid
hexagonality closure condition
hexagonal lattice
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hexagonal nomogram
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hexagonal scalenohedron
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