金属材料碳当量愈髙，焊接性愈差。 （ ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24889' and id < 2124351 and id<>'2124351' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24889' and id > 2124351 and id<>'2124351' order by id asc limit 5