普通投资者申请转变为专业投资者时，证券经营机构对其告知警示资料及录音录像资料的保存期限，应当不得少于（ ）年。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='25454' and id < 2143728 and id<>'2143728' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25454' and id > 2143728 and id<>'2143728' order by id asc limit 5