热镀锌波纹管涵管ckfill,"cuneiform制作中制造商衡水涵管

culvert backfill, "cuneiform area热镀锌波纹管涵管ckfill, "cuneiform制作中制造商衡水涵管" the compaction method adopts the square wooden rod first compaction and then uses the small machine oblique compaction to ensure the backfill press quality.
Scope of application