金属材料在拉断之前均有屈服现象。 （ ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24889' and id < 2124341 and id<>'2124341' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24889' and id > 2124341 and id<>'2124341' order by id asc limit 5