库伦土压力理论的假设是什么?
(1)墙后的填土时理想的散粒(粘聚力为c=0) (2)滑动破坏面为一平面 (3)墙背与滑裂面间的楔形土视为刚性体
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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