back pressure英ˈbækˌpreʃə美ˈbækˌprɛʃɚ短语⁷⁹⁹⁷⁸⁺⁹ 基本例句 背压,回压 This article introduces the function and application of hydraulic- controlled back pressure butterfly- shaped valves, and takes an analysis and detection on hydraulic pressure system. 介绍了液控单向蝶阀的作用和应用,并对液压系统的运行进行了分析和检测。 dictall