孕33周以后，胎儿肾盂宽度正常值应小于（  ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27183' and id < 2252384 and id<>'2252384' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27183' and id > 2252384 and id<>'2252384' order by id asc limit 5