Yuav ua li cas yog lub valve lub cev rusts? Cov lus piav qhia ntxaws txog hom kev sib txuas ntawm ntau qhov tig valve tsav ntaus ntawv (I)
Yuav ua li cas yog lub valve lub cev rusts? Cov lus piav qhia ntxaws ntxaws ntawm kev sib txuas ntawm ntau qhov tig valve tsav ntaus ntawv (I) Nrog rau kev nce qib ntawm kev txawj ntse, kev tsim khoom ntawm kev kub siab, kev kub siab, sib sib zog nqus txias, siab nqus tsev vacuum, muaj zog corrosion, radioactive, flammable a ...
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