留置导尿时，每隔多长时间更换尿管一次(    )

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SQL Error: select id,body,options from ***_enewstiku where sourceid='26322' and id < 2201290 and id<>'2201290' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='26322' and id > 2201290 and id<>'2201290' order by id asc limit 5