词汇	on-off valve
释义	on-off valve 双位阀
随便看	current program segment current program status word current program status word key Current Progress of Astro-geodynamics current pronunciation current proportioning current protect current protection current protective device current protector current psw Current psychoanalytic theories Current psychological situation current psychology current publication survey current public key current pulsation current pulse current pulse amplifier current pulse generator current pulser current pulse relay current pulses current pump current pumping