Enwere ike ịnye ọnụ ụzọ ọkụ ígwè na windo, mkpuchi, mkpuchi ventilashion, wdg dị ka achọrọ. Dị ka dị iche iche ọkụ nguzogide nke ígwè ọkụ ọnụ ụzọ, ha ọkụ ọkụ nwere ike kewaa atọ akara ule: A, B na C.

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