古代夜间计时以“更”为单位，一夜分为五更，那么“五更”是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31515' and id < 2524047 and id<>'2524047' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31515' and id > 2524047 and id<>'2524047' order by id asc limit 5