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GB 50242-2002 第10.2.5条 Code for Acceptance of Construction Quality of Building Water Supply, Drainage and Heating Engineering

Outdoor drainage给排水

GB 50242-2002 第10.2.5条

| **** | The base (trench) treatment of drainage pipes must meet the design requirements; over-excavation backfill or disturbance of undisturbed soil is strictly prohibited. |

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