外压容器的加强圈常用型钢为材料，主要原因是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24888' and id < 2124227 and id<>'2124227' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24888' and id > 2124227 and id<>'2124227' order by id asc limit 5