某高度10m水平砂岩层的建筑边坡,砂岩的密度为2.50g/cm3,其内摩擦角为16°,黏聚力为40kPa。试问:该岩体的等效内摩擦角最接近下列()项。()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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