三一旋挖钻机工法讲座(5)——碎卵石地层中旋挖钻机的施工工法
삼일선알찬궤공법강좌(5)——쇄란석지층중선알찬궤적시공공법
Working method lecture of SANY rotary drilling rig(5)——Working method of the rotary drilling rig in broken pebble strata
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