短語(yǔ)詞組短語(yǔ)expansion relief valve 膨脹安全閥;膨脹釋放閥expansion n valve 膨脹閥expansion space valve gear 膨脹閥動(dòng)裝置thermal expansion safety valve 熱膨脹安全閥thermal expansion goggle valve 熱脹式眼鏡閥expansion n valve piston 伸縮式閥活塞Expansion n Valve PSIA 磅expansion slide valve 膨脹導(dǎo)閥expansion throttle valve 伸縮式節(jié)流閥 返回 expansion valve