岩石边坡的稳定性主要取决于( )。①边坡高度和边度角; ②岩石强度;③岩石类型; ④软弱结构面的产状及性质;⑤地下水位的高低和边坡的渗水性能。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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