等质量下列物质，所含分子数最多的是（） A、CO2 B

等质量下列物质，所含分子数最多的是（）

A、CO₂ B、CH₄C、H₂OD、N₂

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等质量下列物质，所含分子数最多的是（ ） A、CO2 B

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等质量下列物质，所含分子数最多的是（） A、CO2 B