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Fig. 2

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(a) MQ-2 sensor sensitivity characteristics (b) MQ-7 sensor sensitivity characteristics (c) MQ-135 sensor sensitivity characteristics. (Fig. 2a) Hanwei Electronics Co. Ltd, Technical Data MQ-2 Gas Sensor. Available at: http://www.hwsensor.com (accessed: 21 March 2024). (Fig. 2b) Hanwei Electronics Co. Ltd, Technical Data MQ-7 Gas Sensor. Available at: http://www.hwsensor.com, (accessed: 21 March 2024). (Fig. 2c) Hanwei Electronics Co. Ltd, Technical Data MQ-135 Gas Sensor. Available at: http://www.hwsensor.com, (accessed: 21 March 2024).

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