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【单选题】
中华优秀传统文化涉及到很多的化学知识。下列有关说法正确的是
A.
在 “ 火树银花合，铁锁开 ” 中，铁锁开涉及到化学变化
B.
“ 以剂钢为刃，柔铁为茎干，不断折 ” ，剂钢的熔点低于纯铁
C.
“ 青握，以渍，绞取汁 ” ，这种对青蒿素的提取方法属于化学变化
D.
“ 至于矾现五色之形，硫为群将，皆变化于烈火 ” ，其中的矾指的是高价金属硫化物
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