设计无要求,污水池的盖板跨度为4 m时，其模板的起拱高度宜为（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='26169' and id < 2192864 and id<>'2192864' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='26169' and id > 2192864 and id<>'2192864' order by id asc limit 5