当四杆机构出现死点位置时，可在从动曲柄上（ ）使其顺利通过死点位置。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='24893' and id < 2124451 and id<>'2124451' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24893' and id > 2124451 and id<>'2124451' order by id asc limit 5