某岩石、实测单轴饱和抗压强度RC=55MPa,完整性指数KV=0.8,野外鉴别为原层状结构,结构面结合良好,锤击清脆有轻微回弹,按工程岩 体分级标准确定该岩石的基本质量等级为( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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