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例1一个体积是40厘米~3“的铁球,质量是158克,这个铁球是空心的还是实心的?若是空心的,空心部分的体积是多大?
Example 1 An iron ball with a volume of 40 cm to 3 ", with a mass of 158 grams. Is this iron ball hollow or solid? If it is hollow, how large is the volume of the hollow part?