公制螺纹的牙型角为55°。 （）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24886' and id < 2124172 and id<>'2124172' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24886' and id > 2124172 and id<>'2124172' order by id asc limit 5