到了9月12日(星期五)，雷曼已经岌岌可危。
以任意五面体为例，介绍了危石侧面积、体积的计算方法。
A method is also presented for calculating the side area and volume of critical rocks with arbitrary pentahedron as example.
本文在危岩分布规律的基础上分析了该区影响危岩的五大因素；
On the basis of distribution law of dangerous rock, the five main factors that affect dangerous rock are analyzed in this paper.
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