消费者价格心理的一般特征有哪些？
故障概率
《礼记》中记载了这样一段文字：“今大道既隐，天下为家，各亲其亲，各子其子，货力为己，大人世及以为礼。”这段文字中的“大道”是指（）。 ①禅让制 ②世袭制 ③公有制 ④私有制 ["①③","②④","①④","②③"]
（）是对特定刺激的应答，具有不随意性，如食物刺激味蕾分泌唾液。 ["自发性行为","应答性行为","操作行为","工具性条件反射"]
You can use Oracle Flashback to look at past activity in your database. What are two other characteristics of Oracle Flashback？（） ["Oracle Flashback uses undo information to construct consistent data. ","You can use a cursor opened while using an Oracle Flashback image to perform DML once you deactivate Oracle Flashback in your session. ","You can only use Oracle Flashback view of the data if the required records are still in the online redo log files. ","Oracle Flashback lists the DML that was executed during the period you identify when initiating your session.&e"]
有奖销售的不正当行为有哪些？
