1．Which of the following does a 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．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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Which of the following does paper burn in?

[　　]

A．CO2
B．N2
C．O2
D．He

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Which of the following does paper burn in?

[　　]

A．CO2
B．N2
C．O2
D．H2

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