对于下列命题：（1）关于某一直线成轴对称的两个三角形全等；（2）等腰三角形的对称轴是顶角的平分线；（3）一条线段的两个端点一定是关于经过该线段中点的直线的对称点；（4）如果两个三角形全等，那么它们关于某直线成轴对称。其中真命题的个数为（   ）

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Alan and Cindy are in the same school. There are many school rules here. First, they can’t listen to music in the classroom or hallways. But they can listen to it outside or in the music room. Second, they can’t eat in the classroom but they can eat in the dining hall. Can they wear hats in class? No, they can’t. What other（其他的）rules do they have? They can't fight with their（他们的）classmates, either. Fights can make the teachers really unhappy…

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