分段退焊后部台阶后面的台阶后退后桅索向后突出部逐步退焊backstep sequence: 分段后向法; 分段退后次序backstep weld: 分段退焊backstep welding: 分段退焊; 逐步退焊法backstep sequence welding: 分段退焊backstep welding sequence: 分段退焊次序下载手机词典可随时随地查词查翻译
