方法：以分层随机整群抽样的方法，确定调查样本。
Methods: Stratified random cluster sampling method was used to determine the survey sample.
但他们是一组六人一起行动，以确定调查结果的公平性。
However, they operate in groups of six to ensure the fairness of their findings.
OOT警戒可以分为三种类型，用来确定调查的适当程度。
OOT alerts can be classified into three categories to help identify the appropriate depth for an investigation.
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