【单选题】【消耗次数：1】
复合分组是
①
用同一标志对两个或两个以上的总量层叠起来进行分组
②
对某一总体选择 一个复杂的标志进行分组
③
对同一总体选择两个或两个以上的标志层叠起来进行分组
④
对同一总体选择两个或两个以上的标志并列起来进行分组
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