短語詞組短語angle back -pressure valve 背壓角閥;違壓角閥;負(fù)壓角閥dry back -pressure valve 干式布袋濾塵器hydraulic back -pressure valve 液壓止回閥;水壓逆止閥e back -pressure valve 背壓角閥hydraulic c back -pressure valve 液壓止回閥angle e back -pressure valve 背壓角閥hydraulic -controlled back pressure butterfly-shaped valve 液控單向蝶閥slow -closing back pressure valve 緩閉止回閥 返回 back-pressure valve