把暂态过程中δ随时间变化的曲线称为（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69324' and id < 4488050 and id<>'4488050' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69324' and id > 4488050 and id<>'4488050' order by id asc limit 5