精品国产乱码久久久人妻,国语精品国产拍在线观看,黑人VIDEO粗暴亚裔,男同志国产推荐视频网站,老鸭窝在线观看国产精品,免费观看成人a∨片麻豆,国外处破女一区二区,在线看最新国产精品酒店,最近更新中文字幕第一页,xp123视频国产线观

    Industrial salt is widely used in industry and is one of the most basic raw materials in the chemical industry. It is called the "mother of the chemical industry." The main products of basic chemical industry, hydrochloric acid, caustic soda, soda ash, ammonium chloride, chlorine, etc. are mainly used industrial salt as raw material.
    Industrial salt refers to the original salt, salt lake salt, well salt and sea salt points, which because of sea water into a variety of elements dissolved in water, so the industrial value of sea salt is relatively higher, lower edible value.