Chapter II Datum Instruments of Measurement and Standard Instruments of Measurement
第二章 计量基准器具和计量标准器具;
Atlantic standard time acific Standard Time acific standard time
太平洋标准时;
Atlantic standard time acific Standard Time acific standard time
太平洋标准时;
Instruments for the measurement of sound intensity-measurement with pairs of pressure sensing microphones
声强测量仪 用声压传声器对测量;
Methods of measurement for satellite television earthreceive-only station-Door-out unit measurement
卫星电视地球接收站测量方法 室外单元测量;