【名词&注释】
工作压力(working pressure)、焊条电弧焊(shielded metal arc welding)、氧气瓶(oxygen cylinder)、天蓝色(celeste)、普通结构钢(general reciprocal structural steel)
[单选题]焊接普通结构钢(general reciprocal structural steel)钢选用剂焊剂()
A. Hj130 B. Sj301 C. Sj101