小明在探究甲、乙两种不同物质的质量和体积的关系时,得出了如图所示的图线,由图可知,甲、乙两种物质的密度之比ρ甲:ρ乙= .用甲、乙两种不同的物质做成的质量相同的实心体,则它们的体积之比V甲:V乙= .
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