压力控制阀是基于油液（ ）和弹簧力相平衡的原理进行工作的。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='24896' and id < 2124574 and id<>'2124574' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24896' and id > 2124574 and id<>'2124574' order by id asc limit 5