double flange双凸: biconvex缘: reason双凸缘隔框: double-flange frame双凸: biconvex◇双凸机翼 lenticular wing凸缘: flange; bourrelet; lug; rim 环状凸缘 collar flange; 接头凸缘 joint flange; 凸缘管 pipe flange下载手机词典可随时随地查词查翻译