女,30岁,诉心悸胸闷。心尖区闻及收缩期杂音,经检查确诊为甲状腺功能亢进症,心脏无器质性病变,其心脏杂音应具有的特点是()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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