2015年普通高等学校招生全国统一考试物理(北京卷)
2015年普通高等学校招生全国统一考试物理理科综合能力测试(北京卷)13.(2015北京理综,13)下列说法正确的是( )A.物体放出热量,其内能一定减小B.物体对外做功,其内能一定减小C.物体吸收热量,同时对外做功,其内能可能增加D.物体放出热量,同时对外做功,其内能可能不变答案:C解析:据热力学第一定律可知,改变物体内能有两种方法:做功和热传递,仅仅根据单一做功或热传递均无法判断内能的变化情况,故A、B错;物体吸收热量,内能增加,对外做功,内能减少;如果吸收热量比对外做功更多,则物体内能增加,故选项C正确;D选项中,物体放出热量和对外做功均会使内能减少,故内能一定减少,选项D错误。14....
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