在下列条件下,两种气体的分子数一定相等的是           ( 

在下列条件下,两种气体的分子数一定相等的是              

A.同质量、不同密度的N2C2H4        B.同温度、同体积的O2N2

C.同体积、同密度的CO CH4          D. 同压强、同体积的N2O2

答案

A

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