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user kuk
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B.首先D是求不出来的。然后看ABC，因为是理想气体，所以气体所含有的内能大小就是分子平均动能的大道小，也就是温度 既然知道了起始和结束的温度，就能够算出内能的变化（ΔU=ΔPΔV=nRΔT），而本题中没有说明改变内能的方式，可能是做功可能是热传递也可能两种方式都有，所以A和C说得绝对了，错误
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