1)drifter,支柱式开山机2)telescopic drilling post,伸缩式钻机支柱3)open side press,单柱开式压力机4)two column press in open type,开式双柱压力机5)split pillar,开尾支柱6)prop-setting angle,支柱迎山角
用法和例句
The prop-setting angle determine and work and acceptance means in Xian De Wang Mine;
