患儿,6岁。右下6萌出1/3,右下E早失，右下D近远中邻洞银汞充填体完好，做过完善根管治疗。应选择何种保持器更好

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='29938' and id < 2427738 and id<>'2427738' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29938' and id > 2427738 and id<>'2427738' order by id asc limit 5