3岁男孩,平日健康,生长发育正常,体检发现心尖部可闻及II级短促柔和的收缩期杂音,传导局限,心电图检查正常,X线胸片检查正常,最大可能性为
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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