A: Peb lub tswb ceeb toom pa taws siv cov qib siab dual infrared emitting diode (IR LED), paub txog kev tshawb pom sai ntawm cov hluav taws kub hnyiab nrog rau txo cov tswb cuav. Peb lub tswb ceeb toom CO siv cov khoom siv hluav taws xob zoo rau kev kuaj xyuas cov pa roj carbon monoxide txhim khu kev qha.














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