贫血
贫血是指外周血中单位容积内血红蛋白浓度(HB.、红细胞计数(RBC.和(或)血细胞比容(HCT)低于相同年龄、性别和地区的正常标准。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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