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1、单击此处编辑主标题,单击此处编辑副标题,火车运输主题,火车运输主题,正文标题,第一级第二级 第三级第四级第五级,样例文本A,这是GemmiC系列PPT模板中的一款，它是一款高质量、高清晰、高人气的PPT模板，它精致简洁，自然醒目，雅致得体，干净无作者logo水印，图表丰富，不可多得哦。更多精美漂亮的PPT模板正在不断更新和丰富中，敬请关注GemmiC新浪微博。收录本文档的豆单：,样例文本B,首先，宇宙到底是不是“平坦空间”，即大范围内遵守欧氏几何的空间还未清楚。目前，大部分宇宙学家认为已知宇宙除了大质量天体造成的局部时空褶皱，是基本平坦的就像湖面是基本平坦但局部有水波一样。最近威尔金森微波各向
2、异性探测器观测宇宙微波背景辐射的结果也肯定了这一认识。其次，尚未清楚宇宙是否是多重连接。根据大爆炸理论，宇宙是没有空间边界的，然而其空间大小可能是有限的。我们可以通过二维的概念类推：一个球面没有边界，但是它的面积是有限的（4R2）。它是一个在三维空间有固定曲率的二维表面。数学家黎曼发现了四维空间中一个与此类似的三维球形“表面”，其总体积为有限（22R3）但三个方向都朝第四个维度弯曲。他还发现了一个“椭圆空间”和“圆柱形空间”，后者的圆柱形两头互相连接但没有弯曲圆柱本身这一现象在普通的三维空间是不可想象的。类似的数学例子还有很多。如果宇宙真是有限但无边界的话，人沿着宇宙中一条任意方向的“直线”走
3、下去，最终会回到出发点，其路线长度可认为是宇宙的“直径”（这个直径是现在人类对宇宙的认识所无法想象的，因为它一定要比我们所见的宇宙部分大得多。）。,样例文本B,首先，宇宙到底是不是“平坦空间”，即大范围内遵守欧氏几何的空间还未清楚。目前，大部分宇宙学家认为已知宇宙除了大质量天体造成的局部时空褶皱，是基本平坦的就像湖面是基本平坦但局部有水波一样。最近威尔金森微波各向异性探测器观测宇宙微波背景辐射的结果也肯定了这一认识。其次，尚未清楚宇宙是否是多重连接。根据大爆炸理论，宇宙是没有空间边界的，然而其空间大小可能是有限的。我们可以通过二维的概念类推：一个球面没有边界，但是它的面积是有限的（4R2）。它
4、是一个在三维空间有固定曲率的二维表面。数学家黎曼发现了四维空间中一个与此类似的三维球形“表面”，其总体积为有限（22R3）但三个方向都朝第四个维度弯曲。他还发现了一个“椭圆空间”和“圆柱形空间”，后者的圆柱形两头互相连接但没有弯曲圆柱本身这一现象在普通的三维空间是不可想象的。类似的数学例子还有很多。如果宇宙真是有限但无边界的话，人沿着宇宙中一条任意方向的“直线”走下去，最终会回到出发点，其路线长度可认为是宇宙的“直径”（这个直径是现在人类对宇宙的认识所无法想象的，因为它一定要比我们所见的宇宙部分大得多。）。,样例文本C,Immanuel KantIn the eighteenth centur
5、y the German philosopher Immanuel Kant developed a theory of knowledge in which knowledge about space can be both a priori and synthetic.11 According to Kant,knowledge about space is synthetic,in that statements about space are not simply true by virtue of the meaning of the words in the statement.I
6、n his work,Kant rejected the view that space must be either a substance or relation.Instead he came to the conclusion that space and time are not discovered by humans to be objective features of the world,but are part of an unavoidable systematic framework for organizing our experiences.12Spherical
7、geometry is similar to elliptical geometry.On the surface of a sphere there are no parallel lines.Euclids Elements contained five postulates that form the basis for Euclidean geometry.One of these,the parallel postulate has been the subject of debate among mathematicians for many centuries.It states
8、 that on any plane on which there is a straight line L1 and a point P not on L1,there is only one straight line L2 on the plane that passes through the point P and is parallel to the straight line L1.Until the 19th century,few doubted the truth of the postulate;instead debate centered over whether i
9、t was necessary as an axiom,or whether it was a theory that could be derived from the other axioms.13 Around 1830 though,the Hungarian Jnos Bolyai and the Russian Nikolai Ivanovich Lobachevsky separately published treatises on a type of geometry that does not include the parallel postulate,called hy
10、perbolic geometry.In this geometry,an infinite number of parallel lines pass through the point P.Consequently the sum of angles in a triangle is less than 180o and the ratio of a circles circumference to its diameter is greater than pi.In the 1850s,Bernhard Riemann developed an equivalent theory of
11、elliptical geometry,in which no parallel lines pass through P.In this geometry,triangles have more than 180o and circles have a ratio of circumference-to-diameter that is less than pi.,样例文本C,Immanuel KantIn the eighteenth century the German philosopher Immanuel Kant developed a theory of knowledge i
12、n which knowledge about space can be both a priori and synthetic.11 According to Kant,knowledge about space is synthetic,in that statements about space are not simply true by virtue of the meaning of the words in the statement.In his work,Kant rejected the view that space must be either a substance
13、or relation.Instead he came to the conclusion that space and time are not discovered by humans to be objective features of the world,but are part of an unavoidable systematic framework for organizing our experiences.12Spherical geometry is similar to elliptical geometry.On the surface of a sphere th
14、ere are no parallel lines.Euclids Elements contained five postulates that form the basis for Euclidean geometry.One of these,the parallel postulate has been the subject of debate among mathematicians for many centuries.It states that on any plane on which there is a straight line L1 and a point P no
15、t on L1,there is only one straight line L2 on the plane that passes through the point P and is parallel to the straight line L1.Until the 19th century,few doubted the truth of the postulate;instead debate centered over whether it was necessary as an axiom,or whether it was a theory that could be der
16、ived from the other axioms.13 Around 1830 though,the Hungarian Jnos Bolyai and the Russian Nikolai Ivanovich Lobachevsky separately published treatises on a type of geometry that does not include the parallel postulate,called hyperbolic geometry.In this geometry,an infinite number of parallel lines
17、pass through the point P.Consequently the sum of angles in a triangle is less than 180o and the ratio of a circles circumference to its diameter is greater than pi.In the 1850s,Bernhard Riemann developed an equivalent theory of elliptical geometry,in which no parallel lines pass through P.In this ge
18、ometry,triangles have more than 180o and circles have a ratio of circumference-to-diameter that is less than pi.,内 容 概 览,图 表,项目1,项目 2,项目 3,添加您的内容,添加您的内容,添加您的内容,阶 段 图,2008,2009,2010,2011,A,B,C,D,?,项 目 图 表,内容内容,项目1,内容内容,项目2,内容内容,项目3,饼 图,因素1,因素2,因素3,因素4,因素5,因素6,图 表,标题,标题,标题,内容,内容,内容,图 表,1,内容,2,内容,3,内容,
19、图 表,项目1,项目2,项目3,添加您的内容,添加您的内容,添加您的内容,图 表,1,2,3,4,5,6,内容,内容,内容,内容,内容,内容,项 目 AB,项目A,项目B,项目内容XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX,项目内容XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX,交 互 图,状 态 图,内容 C,内容 B,内容 A,关 系 图,A结点,D结点,C结点,B结点,A,B,C,D,关系,概 念 图,影 响 分 析 图,文字内容,影响3,影响2,影响1,图 表,转换,内容,1,内容,2,内容,3,1,2,3,图 表,图 表,ccc,AAA,标题,bbb,aaa,BBB,CCC,图 表,核心,A因素,B因素,C因素,D因素,图 表,AAA,BBB,内容,内容,项 目 图,项 目 图,图 表,添加您自己的内容,添加您自己的内容,添加您自己的内容,添加您自己的内容,添加您自己的内容,总 结,1,2,3,4,5,火车运输主题,Thank you！,
