The low quality of pipe material (chemical component, microstructure) is the main reason to result in stress corrosion damage.
管路所用材料的材质状况(化学成分、显微组织等)不佳，是造成应力腐蚀破坏的主要因素。
The paper presents how the pigment of " Ku-shui" rose is studied and determined by UV and chemical method. Its main component is cyanidin - 3 - glycosid and quercetin -glycosid .
用UV和化学方法研究确定了苦水玫瑰花的色素主要成份是矢车菊-3-葡萄糖苦和辅色素树皮黄素管等。
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