【单选题】【消耗次数：1】
《关于加强新型冠状病毒感染的肺炎防控工作的通告》指出，对密切接触者及可疑暴露者实行居家或集中隔离医学观察，观察期限自最后一次与病例发生无有效防护的接触或可疑暴露后（）。
①
8天
②
10天
③
12天
④
14天
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