(来学网)环氧乙烷是易燃、易爆物品,当空气中浓度达到多少时,即有爆炸危险
  • A.
    (来学网)3%
  • B.
    (来学网)5%
  • C.
    (来学网)8%
  • D.
    (来学网)10%
  • E.
    (来学网)15%