At the same time, with unreasonable development and the drain of chemical material, environment, especially water resource has been polluted unprecedentedly.
但同时由于不合理开发与化学物质排放使得环境特别是水资源，易受到前所未有的污染。
The article analyses compositions of wood stain material and methods and mechanism of wood stain; Especially analysing and studying chemical composition and compounding of wood stain.
分析了木材着色材料的成分、着色的方法和机理，对美式涂装中木材着色剂的化学组成和配制进行了分析和研究。
RS125 walking wheel designs for the stainless steel material, especially suitable for chemical, food and corrosive environment.
RS125行走轮为不锈钢材质设计，尤其适用于化工，食品及有腐蚀性的环境使用。
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