三一旋挖钻机工法讲座(4)——旋挖钻机在钻具易打滑地层中的施工工法
삼일선알찬궤공법강좌(4)——선알찬궤재찬구역타활지층중적시공공법
Working method leclure of SANY rotary drilling rig(4)——Working method of the rotary drilling rig when drilling in skidding strata
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