患者,男性,21岁。因头昏、乏力、面色苍白10个月,牙龈出血伴皮肤出血点3周入院。化验:Hb62g/L,白细胞3.4×109/L,血小板32×109/L。骨髓涂片诊断为慢性再生障碍性贫血。对该患者进行骨髓活检,典型的病理改变是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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