Waalku waa qalab ama shay dabiici ah oo nidaamiya, hagaya ama koontaroolaya qulqulka dareeraha (gaasaska, dareeraha, adkaha dareeraha ah, ama slurries) isagoo furaya, xidhaya, ama qayb ahaan xannibaya marino kala duwan. Valves waa farsamo ahaan ku habboon, laakiin inta badan waxaa looga hadlaa sidii qayb gaar ah. In...
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