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从一瓶浓度为20%的消毒液中倒出2/5后,加满清水,再倒出2/5,又加满清水,此时消毒液的浓度为:

  • A7.2%
  • B3.2%
  • C5.0%
  • D4.8%
参考答案: A
解题思路: >>>立即刷题
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