• 空气甲烷浓度超过百分之五时候爆炸

    It explodes at concentrations in the air of as little as 5 percent.

    youdao

  • 空气甲烷浓度超过百分之五时候爆炸

    It explodes at concentrations in the air of as little as 5 percent.

    youdao

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