采用电话拜访开拓房源渠道的方式的局限性包括（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29105' and id < 2369700 and id<>'2369700' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29105' and id > 2369700 and id<>'2369700' order by id asc limit 5