选,10分] 在岩石单向抗压强度试验中,岩石试件长与直径的比值h/d和试件端面与承压板之间的摩擦力在下列哪种组合下,最容易使试件呈现锥形破裂。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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