患者男性,67岁,酗酒30多年,每日约半斤白酒。查体:肝肋下3cm,脾脏肋下4cm。面颈部见蜘蛛痣。化验检查外周血三系均减少,其减少的主要原因应是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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