患者男性,45岁,患十二指肠溃疡,突然出现呕血,面色苍白,脉搏120次/min,血压60/45mmHg,医嘱输血400mL,目的是补充( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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