三一旋挖钻机工法讲座(7)——岩溶地质的旋挖钻机成孔施工工法
삼일선알찬궤공법강좌(7)——암용지질적선알찬궤성공시공공법
Working method lecture of SANY rotary drilling rig(7)——Working method of drilling the hole in the karst geology
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