在下列四种化合物的化学组成中，“○”中所对应的含义最接近的是

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='21540' and id < 1873030 and id<>'1873030' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='21540' and id > 1873030 and id<>'1873030' order by id asc limit 5