操作空气运作轨道，旋转，向下钻孔机或其他钻探机钻爆破洞或直接钻爆破洞。
May operate air-track, rotary, down-the-hole or other drilling machines to drill blast holes or may direct drilling of blast holes.
操作空气运作轨道，旋转，向下钻孔机或其他钻探机钻爆破洞或直接钻爆破洞。
May operate air-track, rotary, down-the-hole or other drilling machines to drill blast holes or may direct drilling of blast holes.
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