<span><span style、" font-family: 宋体;">改善了劳动条件</span></span>
<span><span style、" font-family: 宋体;">焊缝质量好</span></span>
<span><span style、" font-family: 宋体;">节约钢材和电能</span></span>
<span><span style、" font-family: 宋体;">生产效率高</span></span>
<span><span style、" font-family: 宋体;">适应能力强</span></span>