把一铁块放在火炉上加热一段时间后，下列物理量中不变的是（

把一铁块放在火炉上加热一段时间后，下列物理量中不变的是（）

A．铁块的体积　　B．铁块的密度　　

C．铁块的内能 D．铁块的比热容

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把一铁块放在火炉上加热一段时间后，下列物理量中不变的是（

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