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