同温同压下,同体积的气体单质X2和气体单质Y2化合生成气体Z,且反

同温同压下,同体积的气体单质X2和气体单质Y2化合生成气体Z,且反应前后气体体

积不变,则Z的化学式为

AX2Y2         BX2Y         CXY2           DXY

答案

D

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