进行B超检査时，检査前2小时，需饮水400〜500ml以充盈膀胱的是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30939' and id < 2490359 and id<>'2490359' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30939' and id > 2490359 and id<>'2490359' order by id asc limit 5