分部工程较大且较复杂时，可依据（ ）将其划分为若干子分部工程。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25977' and id < 2180403 and id<>'2180403' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25977' and id > 2180403 and id<>'2180403' order by id asc limit 5