短语词组短语single bevel groove weld 单斜槽焊;单斜角槽焊single J groove weld 丁槽熔接single -flare-Vee groove weld 单面半喇叭形坡口焊缝single flare Vee groove weld 单面喇叭形V型坡口焊缝single V -groove weld V形槽熔接 返回 single groove weld