1, Ukulungiselela ngaphambi kokuqala 1).Ngokuhambisana nephampu yokugcoba amafutha, asikho isidingo sokwengeza amafutha ngaphambi kokuqala;2).Ngaphambi kokuqala, vula ngokugcwele i-valve yokungena yephampu, vula ivalve yokukhipha umoya, futhi iphayiphi nepayipi lokungenisa amanzi kufanele ligcwaliswe ngoketshezi, bese uvala i-exhaus...
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