A、The two wing tank pumps are in operation.
B、Only one wing tank pump supplies its associated engine.
C、Both pumps are stopped.
答案：C
A、The two wing tank pumps are in operation.
B、Only one wing tank pump supplies its associated engine.
C、Both pumps are stopped.
答案：C
A. It is retracted by the biased servo valve.
B. It is retracted by aerodynamical forces and locked.
C. It is locked and stop in its actual position.
A. Green electric pump.
B. Yellow electric pump.
C. Blue electric pump.
A. To control the corresponding pack and flow control valve
B. To control the trim air valves
C. To control the hot air regulate pressue valve
A. If the start valve fails open.
B. If the start valve fails closed.
C. In neither case.
A. Feedback
B. Master DSDL
C. Message Data bus
A. To enable the received audio signals to be selected.
B. To enable the received audio signals and the frequencies to be selected.
C. To enable the frequencies of all the radio communication systems to be selected.
A. Low
B. Normal
C. High
A. The bleed temperature sensor
B. The compressor overheat sensor
C. The compressor pneumatic overheat sensor
A. When one RA fails.
B. When both RAs fail and the slats are extended.
C. When both RAs fail below 2500ft.
A. Manually though the MCDU only .
B. Manually though the MCDU and automatically though the DMU.
C. Fully automatically though the DMU.
