A.±150mmB.±200mmC.±300mmD.±400mm
A.200mmB.250mmC.300mmD.350mm
A.挖掘阻力和避開障礙物B.挖掘鏈的磨損和避開障礙物C.挖掘阻力和挖掘深度D.挖掘鏈的磨損和挖掘深度