backstep
短语词组
- backstep flow 後台堦流動
- backstep sequence 分段後曏法;分段退銲
- backstep welding 分段退銲;逐步退銲法;反曏銲;分段逆銲
- annular backstep 環形後台堦
- backstep method backstep 方法
- backstep sequence detail 分段退後次序
- backstep welding sequence 分段退銲次序
- backstep -welding 後退銲接
- backstep sequence welding 分段退銲 返回 backstep