Why does the Leaning Tower of Pisa in Italy lean? It leans because of a mistake. It has leaned almost since the day the builders b____ it.
In 1774, the people of Pisa in Italy wanted to build a bell tower. They wanted the tower to be the m____beautiful bell tower in Italy. The city needed a bell tower because the church(教堂) did not have o____ . As soon as the first floor of the building was finished, the tower started to lean. Builders t____  to make the building straight again as they added more floors, but the leaning tower got w____ as the tower grew. It took about 180 years to finish the tower. Today, the leaning tower has eight f____  It is 54.5 meters t____. And it leans almost 4 meters to one s____ . The tower is also sinking(下沉) into the g ____ on which it was built. Every year, the tower leans a____ 1.7 cm.

尊重自己是人生的一道底线,是人生的一个亮点,自尊无价。尊重他人是人生的一门学问,是人生的一片风景,尊人优雅。“人类有很多高尚的品格,但有一种高尚的品格是人性的顶峰,这就是个人的自尊心。”这是苏霍姆林斯基对自尊的高度评价。
通过学习,相信你对“自尊”有了更多的认识。结合所学知识回答：

如图薄长木板质量为m，跟水平桌面的动摩擦因数为μ，受水平向右的推力F的作用匀速运动，物体从边缘开始，到物体滑离桌边三分之一为止，在此过程中下列说法正确的是（   ）

随着经济的发展，我国的铁路建设步入“高铁时代”。京广高铁于2012年12月26日全线贯通，成为世界上运营里程最长的高速铁路，据此回答，决定高速铁路分布的主导因素是（　　）