Hauv cov mining hauv av, laum rigs yog cov cuab yeej tseem ceeb rau kev rho tawm cov zaub mov muaj txiaj ntsig thiab ores.Drilling jumbo/drilling rig yog ib qho khoom siv muaj zog siv los laum qhov hauv cov pob zeb nyuaj rau kev ua haujlwm mining thiab tunneling.Peb cov hydraulic drilling rigs ...
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