测得某一蛋白质样品中氮含量为0.40g，此样品约含蛋白质

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='30303' and id < 2450320 and id<>'2450320' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30303' and id > 2450320 and id<>'2450320' order by id asc limit 5