三一旋挖钻机工法讲座(6)——大直径深孔桩水上施工的工法探索
삼일선알찬궤공법강좌(6)——대직경심공장수상시공적공법탐색
Working method lecture of SANY rotary drilling rig(6)Working merthod of the large diameter of deep piles construction over water
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