各种形式的能量在一定的条件下可以相互转化.下列实例中属于机械能转化为内能的是( )
A.陨石坠入大气层剧烈燃烧
B.运载“神舟”飞船的火箭点火升空
C.操场边的石凳被晒得发烫
D.汽车气缸里的燃气推动活塞运动
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A.陨石坠入大气层剧烈燃烧
B.运载“神舟”飞船的火箭点火升空
C.操场边的石凳被晒得发烫
D.汽车气缸里的燃气推动活塞运动