Rosins within wires are well distributed.
线内松香分布平均。
The study of preparation of maleated rosins and their application as paper size was started in China in 1974.
我国对马来松香的研制及其用作造纸施胶剂进行了十多年的研究。
The study of preparation of maleated rosins and their application as paper size was started in China in 1974.
我国对马来松香的研制及其用作造纸施胶剂进行了十多年的研究。
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