日常生活中所见到的 “含氟牙膏”、“高钙牛奶”、“补铁酱油”

 日常生活中所见到的含氟牙膏高钙牛奶补铁酱油中的氟、钙、铁应理解为

  A.原子              B.离子              C.元素             D.分子

答案

C

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