下列选项中，不属于医师行牙髓治疗时无菌操作的必要内容的是

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29866' and id < 2422798 and id<>'2422798' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29866' and id > 2422798 and id<>'2422798' order by id asc limit 5