短語詞組短語back -pressure valve 止廻閥;[油氣]廻壓閥;單曏閥;背壓調(diào)節(jié)閥angle back -pressure valve 背壓角閥;違壓角閥;負壓角閥dry back -pressure valve 乾式佈袋濾塵器e back -pressure valve 背壓角閥hydraulic back -pressure valve 液壓止廻閥;水壓逆止閥hydraulic c back -pressure valve 液壓止廻閥angle e back -pressure valve 背壓角閥back pressure relief valve 背壓安全閥shuttle back pressure valve 梭式止廻閥 返回 back pressure valve