Internal Material Carbon Zinc Roj teeb: Muaj cov pa roj carbon pas nrig thiab zinc ntawm daim tawv nqaij, txawm hais tias sab hauv cadmium thiab mercury tsis zoo rau kev tiv thaiv ib puag ncig, tab sis tus nqi pheej yig thiab tseem muaj qhov chaw hauv khw. Alkaline roj teeb: Tsis muaj cov hlau hnyav ions, siab tam sim no, condu ...
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