Isabelomali kanye nokuhlaziywa kwezindleko zokuthengwa kwe-valve yase-China
Ngokuthuthuka okuqhubekayo komkhakha wokukhiqiza izimboni, ama-valve njengemishini yezimboni evame ukusetshenziswa, isidingo sayo semakethe siyakhula. Ezimbonini eziningi, ama-valve asetshenziswa kakhulu ku-petroleum, amakhemikhali, igesi yemvelo, amandla kagesi nokunye ...
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