Cov hlau hnyav yog ib pawg ntawm cov kab mob uas suav nrog cov hlau thiab cov hlau xws li arsenic, cadmium, chromium, cobalt, tooj liab, hlau, lead, manganese, mercury, nickel, tin thiab zinc. Cov hlau ions paub tias yuav paug cov av, cov huab cua thiab dej thiab yog cov tshuaj lom ...
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