患者,女,85岁,因大量呕血、黑便送来急诊。既往有冠心病,肾动脉硬化。立即给予输血、补液及相应的止血措施。对此患者指导液体入量及输入速度最有意义的参考指标是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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