Ltd is a Hi-tech enterprise specialized in the research & development of security &fire alarm and bluetooth module area, including smoke detector, gas leakage detector, PIR detector, Carbon Monoxide detector, fire alarm bell/strobe siren, manual call point, magnetic contact, bluetooth module, BLE module etc
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The lungs consist of several hundred million tiny air sacs called alveoli (an average of about 480 million in an adult lung) [53] that together provide a very large surface area for gas exchange, often compared to the size of a tennis court
ABC News
