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用工程测量方法研究了山西应县木塔是否垂直、层与层之间是否处于扭曲状态、塔底座是否在同一高程上等问题。结果表明，木塔处于复杂的顺时针扭曲状态，证实木塔的损坏是历史地震活动造成的。
Engineering survey method was used to study whether the Yixian wooden tower in Shanxi is vertical or not, whether the layers are in a twisted state and whether the tower base is on the same elevation or not. The results show that the wooden tower is in a complicated twisted clockwise state, confirming that the damage to the wooden tower is caused by historical seismic activity.