OSI/RM协议模型的最底层是（59)。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='29739' and id < 2415641 and id<>'2415641' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29739' and id > 2415641 and id<>'2415641' order by id asc limit 5