Kev puas tsuaj ntawm vuam kev nyuaj siab ntawm qhov nruab nrab zaus qhov chaw vuam tshuab feem ntau yog siv rau hauv 6 yam: 1, vuam lub zog;2, vuam nruj;3, stability ntawm vuam qhov chaw;4, kev ua haujlwm raug;5, seem stability;6. Corrosion kuj.Hauv qab no me me series rau koj los qhia ...
Nyeem ntxiv