精神病患者甲在其妻的陪伴下外出散步,顽童乙前来挑逗,甲受刺激追赶,甲妻见状。竭力阻拦无效,甲将乙的头打破。乙的医药费如何承担
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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