几道初三有关密度的物理题1.有一质量为5.4kg的铝球,体积是3000cm².是判断这个铝球是空心的还是实心的?如果是空心的.则空心部分的体积是多大?(ρ=2.7×10³kg/m³)2.一瓶白酒标有“500
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