backstep
短语词组
- backstep flow 后台阶流动
- backstep sequence 分段后向法;分段退焊
- backstep welding 分段退焊;逐步退焊法;反向焊;分段逆焊
- annular backstep 环形后台阶
- backstep method backstep 方法
- backstep sequence detail 分段退后次序
- backstep welding sequence 分段退焊次序
- backstep -welding 后退焊接
- backstep sequence welding 分段退焊 返回 backstep