基本解釋六角螺紋接頭;六角螺母外螺紋接頭詞組短語短語hexagon n nipple 六角螺紋接頭hexagonal nipple hexagon nipple 六角螺紋接頭hexagon nipple更多詞組專業(yè)釋義經(jīng)濟學六角螺紋接頭