题目

有一铝球，体积是3 cm3，质量是5.4 g，则该球的密度是________g/cm3，它是________(选填“实心”或“空心”)的。(ρ铝＝2.7×103 kg/m3) 答案：【答案】1.8空心【解析】根据密度公式得,球的密度为ρ＝＝1.8g/cm3；ρ铝＝2.7×103kg/m3＝2.7g/cm3;因为球的密度小于金属铝的密度,即1.8g/cm3<2.7g/cm3；故球是空心。 If I had _________ chance to say one thing to _________ healthy children, it would be this：having a disability does not mean your life is not satisfying． [　　] A．a; the B．/;/ C．a;/ D．/; the