某一班级约定上课前要静静地等待老师的到来。这一约定属于 （ ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='26165' and id < 2192602 and id<>'2192602' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='26165' and id > 2192602 and id<>'2192602' order by id asc limit 5