20有甲乙两患者,甲患者左心室舒张末期容积为140ml,收缩末期容积为56ml;乙患者左心室舒张末期容积为160ml,收缩末期容积为64ml,试比较两患者的射血分数:( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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