短語(yǔ)詞組短語(yǔ)roof -bolt t drill 頂板錨栓鑽機(jī)grouted roof -bolt 洞頂灌漿錨桿cemented roof -bolt 鋼筋混凝土錨桿roof bolt plate 錨桿墊板mine roof bolt 鑛頂螺栓expansion type roof bolt 膨脹式錨桿 返回 roof bolt