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2. （6 分) 《本草衍义》中对精制砒霜过程有如下叙述: “取砒之法, 将生砒就 置火上, 以器覆之, 令砒烟上飞着覆器, 遂凝结累然下垂如乳, 尖长者为胜, 平短者次之。”文中涉及的操作方法是（）

Gaokao · Chemistry · previous-year question

  1. A.蒸馏
  2. B.升华
  3. C.干馏
  4. D.萃取

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