unmanned Air vehicle aerial photographic system
air reconnaissance camera
分布式控制系统
分布式控制系统DCS
航空侦察照相机
台湾稻螟
certain type armoured reconnaissance vehicle
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
500 kV unmanned substation
anti-radiation unmanned aerial vehicle