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管道上方标识埋地管道与公路、铁路、河流、管道、光缆、电缆和地下构筑物等的交叉点,标识埋地管道附属设施、水工、地质灾害保护设施以及管道抢修作业点的地面标记。
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regular convex polyhedron
regular convex surface
regular coordinate functions
regular covering
regular covering space
regular covering surface
regular curve
regular cusp
regular decagon
regular decomposition
regular dependence
regular design
regular determinant
regular differentiable mapping
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regular Dirichlet form
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regular dodecagon
regular dodecahedron
regular dodecahedron group
regular domain
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