The experimental results and application effects of weld toughness of spirally submerged arc welded pipe are introduced. 本文介绍了埋弧焊钢管焊缝韧性试验研究的结果及工业生产应用效果。
This paper also expounded the characterization of the edible tannin, usages heed matters and conditions of the production and application. 阐述了食用单宁的特点,使用方法,注意事项以及生产应用的情况。