和 .Who can help me 1.A 、B 是体积相同的两个实心球,A求密度为1.2g/cm3,B求密度为0.8X(10)3次方kg/m3.同时投入足够多的水中静止时,它们各自受到的浮力大小之比FA ：FB =2.有一木块.放入水中时有2/5的

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