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Air Sac , air sac 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… compressed air , compressed air Air under pressure. This may be used in tunnels to balance the pressure of water in the ground and so control groundwater. Compressed… Ground Bass , ground bass (It. basso ostinato, ‘obstinate bass’). Short thematic motif in bass which is constantly repeated with changing harmonies while upper par… entrainment , entrainment The process by which air from the environment outside a growing cloud is caught into the rising convective current within the cloud and m… BROWNING, ORVILLE HICKMAN , Air Force, U.S. OverviewPredecessors of, 1907–46Since 1947
Air Force, U.S.: Overview The U.S. Air Force, the world's most powerful air arm, was not a…
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