A more in - depth discussion of resistance and impedance standards , and how such standards are realized , represented and compared in metrology laboratories 更深入地讨论电阻标准和阻抗标准,及如何在计量实验室实现、表达和比较这些标准。
A more in - depth discussion of commercially available time and frequency measurement equipment and standards , and how such instrumentation can be used in the metrology laboratory 市场上可用的时间频率测量设备和标准的更深入的讨论,以及此类仪器如何应用在计量实验室。