材料的选择原则首先满足（ ）要求的前提下，再考虑工艺性、经济性。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24887' and id < 2124195 and id<>'2124195' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24887' and id > 2124195 and id<>'2124195' order by id asc limit 5