有A、B、C、三个由同种材料制成的金属球,它们的质量分别为128g、40

ABC、三个由同种材料制成的金属球,它们的质量分别为128g400g60g,体积分别为16cm350 cm312 cm3。在ABC三个金属球中,若只有一个是空心的,那么       球是空心的,这种材料的密度为          

答案

C   8g/cm3  

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