ABB automatic air switch
air horn
空气喇叭
角形气隙
气喇叭
空气报警器
气压警报器
气笛
气号
汽笛
气流振响报警号
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
1# 10000 m3 air separation unit
135 MW direct air cooling unit