PMU主子站间通信时采用（ ）协议作为底层通信协议。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29465' and id < 2399159 and id<>'2399159' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29465' and id > 2399159 and id<>'2399159' order by id asc limit 5