边界摩擦是指摩擦只存在于摩擦件的边缘处。 （ ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24897' and id < 2124632 and id<>'2124632' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24897' and id > 2124632 and id<>'2124632' order by id asc limit 5