基本解釋[經(jīng)濟(jì)學(xué)]對(duì)頭焊接鉆頭詞組短語(yǔ)短語(yǔ)butt -welded U drill 對(duì)頭焊接鉆頭butt-welded drill更多詞組專業(yè)釋義經(jīng)濟(jì)學(xué)對(duì)頭焊接鉆頭