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Air Sac , air sac Apra , APRA Air Public Relations Association United States Air Operations , World War II, U.S. Air Operations in: The Air War in Europe. U.S. air operations in the Mediterranean and Europe evolved into two distinct fields of… Air Bag , Background
An air bag is an inflatable cushion designed to protect automobile occupants from serious injury in the case of a collision. The air bag i… Ventilation , ventilation, process of supplying fresh air to an enclosed space and removing from it air contaminated by odors, gases, or smoke.
Proper ventilation… Arctic front , Arctic front The frontal boundary between cold, Arctic air and warmer air masses, usually lying to the south of it. Many depressions originate on it.…
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free-to-air