Ebe a na-echekwa ihe ọla, ma n'ime ma n'èzí ụlọ nkwakọba ihe, kwesịrị ịdị ọcha ma kpọọ nkụ, pụọ na ụlọ ọrụ mmepụta ihe nke na-emepụta gas na uzuzu na-emerụ ahụ ma ghara ịgwakọta ya na acid, alkalis, salts, gas, powders na ihe ndị ọzọ.Nchekwa kwesịrị ịbụ c...
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