我国规定外压筒体的稳定系数r«=（） 。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24818' and id < 2121710 and id<>'2121710' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24818' and id > 2121710 and id<>'2121710' order by id asc limit 5