单级泵; 单流向泵; 单流向的泵

single pump single parent single paddle single pulley single-handed single capacitor single bolting single harness single tone single pusher pump (single-action; single acting) single-screw (single screw) pump single-suction centrifugal pump single-stroke deepwell pump single cylinder piston pump single-valve knapsack pump single centrifugal pump twin-single pump single-acting pump single-channel impeller pump single-action pump