在机械传动零件接触中最不希望出现的摩擦是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24897' and id < 2124604 and id<>'2124604' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24897' and id > 2124604 and id<>'2124604' order by id asc limit 5