IEC 60135:1961 电子管和电子阀中电极的编号和单位标识 Numbering of electrodes and designation of units in electronic tubes and valves 标准号：IEC 60135:1961 发布日期：1961-01-01
IEC 60135:1961
IEC 60135:1961 电子管和电子阀中电极的编号和单位标识 Numbering of electrodes and designation of units in electronic tubes and valves 标准号：IEC 60135:1961 发布日期：1961-01-01
IEC 60135:1961