单闸板 Single gate disc

单闸板平板闸阀 Single Disc Flat Gate Valves

单闸板防喷器 single ram preventer ; single ram type BOP

单闸板平板 Single Disc Flat Gate Valves

单闸瓦制动 single type brake

单闸片离合器 [机] single-plate clutch

单极闸刀开关 [电] single-pole knife switch ; one-pole knife switch

单闸板防喷器主壳体 Shell of single ram type preventer