进行网络互连，当总线网的网段己超过最大距离时，可用（ ）来延伸。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29469' and id < 2398824 and id<>'2398824' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29469' and id > 2398824 and id<>'2398824' order by id asc limit 5