• 2022-06-17
    NO的英文名称是_______。
    A: nitric oxide
    B: nitrogen fixation
    C: nitric acid
    D: nitrogen oxygen
  • A
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      The most significant constituents of coal are . A: hydrocarbons B: sulfur C: oxygen D: nitrogen

    • 1

      The following _____ process is not good for agricultural production A: Nitrogen fixation B: Methane production C: Denitrification D: Ammonification

    • 2

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    • 3

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    • 4

      Nitrogen and oxygen are ___ important ___ most living organisms cannot survive without these elements.