闻名遐尔的意大利比萨斜塔是著名科学家伽利略做物体重力加速度实验的地方。但比萨斜塔年久失修,倾斜度越来越大,很可能倒坍。为了拯救比萨斜塔,意大利拯救比萨斜塔专家委员会最近决定用液氮冷却塔基1米深的混凝土层,并在塔基北部打入10根长50米的钢柱,以阻止该塔向南倾斜。为了减轻地下含水层对塔基的压力,必须将塔基下面1米深处的混凝土切土切割掉。为了不影响塔基本身,专家们决 The famous Leaning Tower of Pisa, Italy, is where Galileo, a famous scientist, did gravity acceleration experiments. However, the Leaning Tower of Pisa has been in disrepair for a long time, and the inclination is getting bigger and bigger. It is very likely that it will collapse. In order to save the Leaning Tower of Pisa, the Committee of Experts of the Italian Tower of the Pisa Levitation of Salvation recently decided to use liquid nitrogen to cool the concrete layer one meter deep from the tower base, and in the northern part of the tower base ten steel columns of 50 meters in length to stop the tower from facing south tilt. In order to reduce the pressure of the underground aquifer on the tower base, the concrete cut-offs must be cut at a depth of 1 meter below the tower base. In order not to affect the basics of the tower, the experts decided