短語詞組短語single bevel groove weld 單斜槽焊;單斜角槽焊single J groove weld 丁槽熔接single -flare-Vee groove weld 單面半喇叭形坡口焊縫single flare Vee groove weld 單面喇叭形V型坡口焊縫single V -groove weld V形槽熔接 返回 single groove weld