当蜗杆的螺旋线升角小于啮合面的当量摩擦角时，蜗杆传动具有自锁性。（ ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24895' and id < 2124562 and id<>'2124562' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24895' and id > 2124562 and id<>'2124562' order by id asc limit 5