A、<span lang="EN-US" style="LINE-HEIGHT: 125%; mso-bidi-font-size: 10.5pt">E43</span><span style="LINE-HEIGHT: 125%; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: " times="" new="" roman";="" mso-hansi-font-family:="" "times="" roman""="">型焊条</span>
B、E50
C、E55
D、E50