The fibre ? ? s number average length is shortened during alkali pretreatment and hot - water pre - extraction process.

而热水预提取后木片的纤维数均宽度减小,长宽比变化不大.

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The number - average molecular weight of poly ethylene - glycol - adipate diols didn't affect the heat decompose temperatures of polyurethanes.

聚己二酸乙二醇酯二元醇的分子量对聚氨酯的热分解温度影响不明显.

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