[填空题] 集合行为最显著的特征是（）。

“社会问题产生的根源是不平等、不合理的社会制度”，这一思想来源于（）。 教育学的产生和发展大体上经历了（）阶段、（）阶段和（）阶段。 计划经济是人为因素干扰经济规律的作用。 The user SYS creates a job by using the following command: Which two statements are true about the job that was created by the preceding command?（） [" The job is enabled by default after creation"," The job is automatically dropped after the end date"," The job executes with the privileges of the user SYS",""] 对于一个好的演绎论证，所有前提均真而结论为假是（）的。 ["不知道","可能","不可能","坏"] 集合行为最显著的特征是（）。