Plastic bag with micro air vent
unmanned Air vehicle aerial photographic system
micro gas chromatography micro GC
Air Leakage Rate of Air Preheater
air to air heat recovery unit
air to air missile launching envelope
arctic air [= arctic air mass]
continental air [= continental air mass]
main air port exhaust air
marine air [= marine air mass
variable air volume (VAV) air conditioning system
variable air volume air conditioning system
bionic flapping wing flying micro-robot