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    Which of the following does paper burn in? A.CO2 B.N2 C.O2 D.H2 【查看更多】

     

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    Which of the following does paper burn in?

    A. CO2                                  B. N2                                     C. He                            D. O2

     

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          Which of the following does paper burn in?

           A. CO2                        B. N2                           C. He                    D. O2

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           Which of the following does paper burn in?

           A. CO2                        B. N2                           C. He                   D. O2

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    Which of the following does paper burn in?

    A．CO2              B．N2                C．O2                 D．H2O

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    Which of the following does paper burn in?

    [　　]

    A．CO2

    B．N2

    C．He

    D．O2

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