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DN20-DN400PERT2型聚氨酯发泡保温管
DN20-DN400PERT-II型聚氨酯硬质泡沫保温管
DN20-DN400PERT聚氨酯直埋保温钢管
DN20-DN400PERT-II型聚氨酯发泡保温钢管
DN20-DN400PE-RT II型预制直埋保温管
DN20-DN400PERT聚氨酯保温管应用
DN20-DN400温泉管道pertii型聚氨酯直埋供热管
DN20-DN400温泉水用pertii型聚氨酯管
DN20-DN400PE-RT II供热聚氨酯保温管
DN20-DN400PE-RTII型供热聚氨酯保温管道厂家
DN20-DN400耐高温PERT聚氨酯温泉保温管
DN20-DN400PE-RT II型预制聚氨酯泡沫直埋保温管
DN20-DN400PE-RT II型热力聚氨酯保温管厂家
DN20-DN400PE-RT II型温泉聚氨酯保温管厂家