?双座阀

... 双座的 double banked; double-banked; two-seated 双座阀 double beat drop valve; double beat valve; double seat (or beat) valve; double seat ale; double seat valve; double seated valve; double-beat drop valve; double-beat dropvalve; double-beat valve; double-beatdropvalve; double-beatvalve; double-seat valve; doubleseatorbeatvalve; doubleseatvalve 双座机 double seater; doubleseater ...