Umoya olawula ivelufa ibhekisa kwivelufa yomoya womoya, othatha umthombo womoya njengamandla, isilinda njengesixhobo, umqondiso we-4-20mA njengophawu lokuqhuba, kwaye uqhuba ivalve ngokusebenzisa izinto ezinje ngombane wevalufa yombane , ...
Funda ngokugqithisileyo