题目

        She is a cute, quite girl. As a daughter, she has no secret from her mother, who is very pleased with her. But these days she has become not so open as before. She has a diary that she keeps under lock and key. Her mother cannot help worrying about her: what if she falls in love, which is too early of her age? After all she is reaching the dangerous time. These thoughts have caused trouble in her mother's mind.       One weekend the girl came to tell her mother that she was going to the cinema with her schoolmate and would return late. This was the first time her mother agre如图，在空气压缩引火仪玻璃筒的底部放一小撮干燥的棉絮，用力将活塞迅速向下压，结果棉花被压燃，这是活塞对对做功，使它的内能 ， 温度 ， 达到棉花燃点的缘故.压缩过程中能转化为能.实验中如果用小纸片代替棉絮，小纸片并没有燃起，则关于压缩过程中的能量转化的结论（选填“成立”或“不成立”）.