concave weldinverted weld凹面: camber concave; concave surf ...焊缝: soldering seam; weld bead; w ...凹焊缝 凹面焊 凹形焊缝 轻型焊: concaveweld凹面焊: concave weld背面焊缝: back bead; back run; back weld; underside weld下载手机词典可随时随地查词查翻译
