短語詞組短語flat slide valve 平滑閥;平座閥平滑閥閘閥;平座閥balanced flat slide valve 自動平衡平滑閥flat seat valve 平座閥flat throttling valve 平面節(jié)流閥flat head valve 平頭氣門flat check valve 平面型單向閥flat headed valve 平頂氣門Imported Flat Gate Valve 進(jìn)口平板閘閥 返回 flat valve