患者，女，50岁。自觉右颊黏膜粗糙感2月。临床检查:双颊黏膜有白色条纹，呈树枝状。下列选项中，对诊断最为重要的检查是

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29988' and id < 2430252 and id<>'2430252' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29988' and id > 2430252 and id<>'2430252' order by id asc limit 5