词汇与结构The air is ______by the pneumatic system via two pack flow control valves, two packs, the mixing unit, which mixes the air coming from the cabin and from the packs which is located in the wing root area.
A. started
B. offered
C. supplied
D. shown
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词汇与结构In this case the headset is switched automatically to a cabin loudspeaker, with the pilot using the microphone in the mask which may ______ the readability to ATC.
A. increase
B. add
C. reduce
D. keep
词汇与结构The air conditioning system supplies conditioned bleed air and _______ cabin air at a controlled temperature throughout the airplane.
A. recirculated
B. cycled
C. recycled
D. miscalculated
词汇与结构The air conditioning system supplies conditioned air to the flight deck shoulder ______.
A. belts
B. harness
C. heaters
D. equipments
词汇与结构The air condtoning system supplies ______for the passenger cabin, lavatories, galleys.
A. dilution
B. ventilating
C. ventilation
D. ventilator