两摩擦表面间未加入任何润滑剂的摩擦状态称为（ ）。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='24897' and id < 2124602 and id<>'2124602' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24897' and id > 2124602 and id<>'2124602' order by id asc limit 5