49患者,女性,40岁,呕血、黑便后出现头昏、乏力、面色苍白、四肢厥冷、出冷汗、心悸、脉地血压下降,提示该患者出血量已达:( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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