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spruce wood中文是什么意思

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用"spruce wood"造句"spruce wood"怎么读"spruce wood" in a sentence

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  • 云杉木

例句与用法

  • Lignin composes about 15 ~ 36 % by dry weight in norway spruce wood and has to be removed in chemical pulping for the manufacture of high quality paper . a slight decrease of lignin in wood ' s is estimated to significantly reduce the consumption of environmentally harmful chemicals during chemical pulping
    木质素的存在影响到纸浆和造纸的质量,所以在木材加工成纸浆的过程中,必须用大量的化学物质除去它,这样不但增加生产成本,而且在处理过程中会给环境造成很大的污染。
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