【单选题】熔化极C02气体保护焊,2mm碳钢薄板仰位角接接头焊接时,选用0.8mm焊丝,焊接电压选择范围一般在()。
【单选题】熔化极C02气体保护焊,2mm碳钢薄板仰位T型接头焊接时,焊枪角度一般与焊缝夹角为(),与焊缝转角为45度。
【简答题】♢Exercise2 Directions :Listen to the passage agai n and fill in the blanks
【单选题】Choose where the words best fit in the blanks. Complete this form to place a(n) _________.
【简答题】Fill n the blanks with the word or expressions given below, and change the form where necessary . donate carry out draw result efficiency different consume ex...
【单选题】fill in the blanks with proper words:Nǐmen shànɡkè你们上 课?
【单选题】熔化极C02气体保护焊,2mm碳钢薄板仰位角接接头焊接时,焊枪角度一般与焊缝夹角为(),与焊缝转角为45度。