教育部根据社会发展的变化，公布了新的中小学生行为规范守则。中学生与小学生生活、学习环境相似，对学生要求具有一致性，因此原来的中学生守则和小学生守则合二为一，成为《中小学生守则》，有利于坚持对中小学教育的一致性和连续性。对中小学生针对其特点，有不同要求，比如要求小学生“注意安全，防火，不做有危险游戏”，对中学生要求“不吸烟，不滥用药物，拒绝毒品”。

请分析教育部制定《中小学生守则》体现了唯物辩证法的那些道理？

    Many people like to watch TV, There are all kinds of programs on TV. The soap opera is one of them.

    The soap opera was first on the radio in the 1920s, then it started on TV in the 1940s. Why do so many people like to watch soap operas on TV, especially young people? What makes soap operas popular? Let's find out.

    First, what's happening in the soap opera is very different from our lives. Everything is perfect in the play, People don't need to worry about almost anything. People don't have more Problems.

    Second, there are many beautiful girls and handsome boys in the soap opera. They are cool. They make young people crazy. They make young people happy.

    Third, the story in the soap opera is usually interesting. It makes people relaxed after a day's hard work. Even some old people like to watch it, too.

    But some people don't like it, they think the show is too slow and too long. Do you like to watch soap operas? What do you think of them?

《九章算术》是中国传统数学最重要的著作，奠定了中国传统数学的基本框架．它的代数成就主要包括开方术、正负术和方程术．其中，方程术是《九章算术》最高的数学成就．

《九章算术》中记载：“今有牛五、羊二，直金十两；牛二、羊五，直金八两．问：牛、羊各直金几何？”

译文：“假设有5头牛、2只羊，值金10两；2头牛、5只羊，值金8两．问：每头牛、每只羊各值金多少两？”

设每头牛值金x两，每只羊值金y两，可列方程组为____ .

如图所示，固定在竖直平面内的光滑圆环的最高点有一个光滑的小孔质量为m的小球套在圆环上一根细线的下端系着小球，上端穿过小孔用手拉住现拉动细线，使小球沿圆环缓慢上移在移动过程中手对线的拉力F和轨道对小球的弹力N的大小变化情况是（   ）