Chapter one reviews the research in this area at home and abroad, and raises the research purpose, range, research method and the significance.
第一章对国内外的研究概况做了简要回顾，并提出了本文研究目的、范围，研究方法及意义。
At present, China Lesso offers a comprehensive range of products in domestic home building materials area which includes more than 10,000 specifications.
现阶段，中国联塑拥有10000多种产品，是国内建材家居领域产品体系齐全的生产商。
At present, China Lesso offers a comprehensive range of products in domestic home building materials area which includes more than 10,000 specifications.
现阶段，中国联塑拥有10000多种产品，是国内建材家居领域产品体系齐全的生产商。
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