古代罗马的公民法强调“法律面前人人平等”。这里的“人人”是指

2017年10月，冰城哈尔滨已经渐入寒冬，路边的公交车站长凳座椅变得冰凉。一位84岁的老奶奶为公交站座椅缝制了座套，让那些等待公交车的乘客，坐在长凳上不再受凉。乘客们说在等车时，站累了可以坐下来休息，感觉非常暖心。据了解，这位老奶奶从去年就为家附近4个站台的公共座椅做垫子，垫子脏了她还会拿回去洗，坏了她也会重新缝制。当大家对这位老奶奶致谢时，她简单地说：“不用感谢。”

There is a new park near Andy's home. It's fine today. Andy and his family are in the park now. On their left, there is a café. On the right, there is a big lake. There are many flowers and trees around the lake. There's a small hill behind the lake. Near the lake, there are two signs（标记）. One says, "Don't swim in the lake."But you can go boating on the lake. There is a beautiful garden in the middle of the park. There are green grass and beautiful flowers in it. There are some small shops between the lake and garden. The park is so nice. Andy and his family like it very much.

在实际应用中，我们忽略了剪刀、压水井柄等的形状和形变，都把它们看作是杠杆．这一方法在物理学中有着广泛的应用，下列事例中属于这一方法的是

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在式子、、、、、中，分式的个数有（     ）