refine weblio(attenuate or reduce in vigor, strength, or validity by polishing or purifying) to refine g. to refine iron. to refine wine. to refine sugar (intransitive) to become pure; to be cleared of impure matter. to refine electrolyte by removing antimony in the electrolyte of a deteriorated lead battery.history of gunpowder gunpowder is the first explosive to have been developed. popularly listed as one of the "four great inventions" of china, it was invented during the late tang dynasty (9th century) while the earliest recorded chemical formula for gunpowder dates to the song dynasty (th century).knowledge of gunpowder spread rapidly throughout asia, the middle east and europe, possibly as a result of the
germanium element information, properties and usesand silicon is a more effective semiconductor for making electronic components. but to have the effective silicon electronics we now depend on for everything from computers to mobile phones, requires extreme precision in purifying the element, which meant that silicon electronics weren't feasible on achlorine chlorine is a chemical element with the symbol cl and atomic number . the secondlightest of the halogens, it appears between fluorine and bromine in the periodic table and its properties are mostly intermediate between them. chlorine is a yellowgreen gas at room temperature. it is an extremely reactive element and a strong oxidising agent among the elements, it has the highest electron
nice classification th edition, version nice classification th edition, version class 1 page 2 010022 adhesive preparations for surgical bandages 010028 adhesives for billposting 0 adhesives for industrial purposes 0103 adhesives for paperhanging / adhesives for wallpaper 010573 adhesives for wall tiles 010690 adjuvants, other than for medical or veterinary purposes 010029 agaragar 010030 agglutinants for concrete
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