患儿,女,15岁,以发热、月经流血不止急性起病;查体:贫血貌,浅表淋巴结、肝脾均未触及肿大,血规: WBC 1.2×109/L, Hb54g/L, PLT 26×109/L,骨髓常规:增生低下,未见原幼细胞;未见病态造血,最大可能的诊断为
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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