短语词组短语cathode e heater 阴极加热器cathode e heater assembly 阴极加热器cathode -heater i ulation resistance 丝极绝缘电阻Cathode -Heater Voltage 阴极cathode heater assembly 阴极加热器cathode heater tube 旁热式电子管heater cathode 旁热式阴极;直热式阴极 返回 cathode heater