By means of cyanoethylation and chlorination,wood sawdust was converted into thermoplastic material and then compounded with short sisal fibers.
通过氰乙基
反应,使木粉转
成为热
性材料,再

剑麻纤维混合,热
制得植物纤维增

植物纤维基复合材料。
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We still see high rates of autoimmune disease in countries where there are higher levels of sanitation, there's more washing, there's more chlorination, there are more chemicals, there are fewer microbes compared to less developed countries.
我们依然发现,在
些卫
条件更好、洗涤更频繁、氯化处理更多、化学
质更丰富、

相对较少的发达国家,自身免疫性疾病的发病率较高,相比之下,在卫
条件较差的发展中国家,这一现象则不
么明显。