solenoidn.螺线形电导管Solenoid-valve driving电磁阀驱动solenoid valve for freon氟里昂用电磁阀solenoid valve for water水用电磁阀solenoid regulator valve电磁阀调压阀solenoid valve for steam蒸气电磁阀solenoid actuated relays螺线管式继电器solenoid diaphragm valves水力电磁隔膜阀solenoid valve components电磁阀部件solenoid-operated valve电磁控制阀solenoidal magnetic field螺线管磁场