The emerging causes of mixed gum rosin were analyzed, and the controlling methods were also produced.

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。

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The emerging causes of mixed gum rosin were analyzed, and the controlling methods were also produced.

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。

youdao