Ma Crawler drills, omwe amadziwikanso kuti ma track-mounted drills, ndi makina obowola amphamvu omwe amagwiritsidwa ntchito kwambiri m'mafakitale osiyanasiyana.Amapangidwa makamaka kuti azigwira ntchito m'malo ovuta komanso ovuta, zomwe zimawapangitsa kukhala abwino pobowola migodi, zomangamanga, ndi zowunikira.Mu th...
Werengani zambiri