松香的分类是根据公布的实验室和临床资料。
The classification of rosin was based on published laboratory and clinical data.
松香的主要成份是松香酸(C20H30O2)。
分析了混合松香产生的原因；提出了对混合松香的控制建议。
The emerging causes of mixed gum rosin were analyzed, and the controlling methods were also produced.
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