单选题 The fuel is mainly kept in fuel tanks which are( )

单选题 The APU is equipped to supply electrical and （ ） power to the aircraft.

单选题 The cockpit is equipped with （ ） seats

单选题 The Very High Frequency (VHF) system is used for all ( ) communications

单选题 The A320 aircraft has Main Landing Gears and ( )

单选题 （ ）, which enables to detect the start of a fire or smoke, localized and neutralized quickly

单选题 （ ) normally supply the aircraft electrical power in flight

单选题 In normal conditions, the pneumatic system supplies air to the air conditioning system from:APU、（ ）、high-pressure ground-air supply-unit