A: Mkpu anwụrụ ọkụ anyị na-eji diode infrared dual emitting diode (IR LED), nke a maara maka ịchọpụta ọkụ ọkụ na-ere ọkụ ngwa ngwa yana ibelata mkpu ụgha. Mkpu CO anyị na-eji ihe mmetụta electrochemical ziri ezi maka nchọpụta carbon monoxide a pụrụ ịtụkwasị obi.














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