계량 및 규격화 PDF 2022-1
http://www.dprkmedia.com.00991137000a.erf.sbb.spk-berlin.de/Uploaded/Journal/2101/KPJ_80952.pdf
Weighing And Standardization (dprkmedia) March 12, 2022
http://www.dprkmedia.com.00991137000a.erf.sbb.spk-berlin.de/Uploaded/Journal/2101/KPJ_80952.pdf