患者,男,48岁。因黑便3天入院。患者有饮酒嗜好10余年,每天饮半斤白酒。查体:肝肋下2.5cm,脾肋下4.5cm,余无明显异常。血常规提示外周血三系减少。该患者血常规异常的主要原因是
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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