男性,28岁。车祸伤致脾破裂。急诊剖腹探查见腹腔内积血量达2500ml,用升压药维持血压在80/60mmHg。此时应首先选择下列哪种成分血输注()。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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