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【单选题】
理想气体的热力学系统，在下列哪个过程中系统的内能保持不变？ （ ）A.
等压过程
B.
等体过程
C.
等温过程
D.
绝热过程
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
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