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Gaokao Chemistry Practice Question

7. 生活中处处有化学, 下列叙述正确的是

  1. A.HB 铅笔芯的成分为二氧化铅
  2. B.碳酸氢钠可做食品膨松剂
  3. C.青铜和黄铜是不同结构的单质铜
  4. D.焰火中红色来源于钠盐灼烧

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