A、As the differential pressure between the cabin and the atmosphere is sufficient, the vacuum generator does not operate.
B、As the differential pressure between the cabin and the atmosphere is not sufficient, the vacuum generator does not operate.
C、As the differential pressure between the cabin and the atmosphere is sufficient, the vacuum generator operates.
答案：A
A、As the differential pressure between the cabin and the atmosphere is sufficient, the vacuum generator does not operate.
B、As the differential pressure between the cabin and the atmosphere is not sufficient, the vacuum generator does not operate.
C、As the differential pressure between the cabin and the atmosphere is sufficient, the vacuum generator operates.
答案：A
A. One.
B. Two.
C. Three.
A. The outflow valve,emergency ram air inlet ,avionics ventilation and pack flow control valve close
B. Only the outflow valve close
C. Only the outflow valve is not automatically controlled to close
A. As soon as the aircraft is energized.
B. As soon as the flush switch is pressed in ,and only if the altitude pressure switch is closed.
C. As soon as the altitude pressure switch closes.
A. ADIRU.
B. Transceiver.
C. Antenna.
A. By two electrical motors.
B. By a dual solenoid.
C. Hydraulically by servofule.
A. The speed manually inserted by the crew into the FCU .The light is off.
B. The speed manually inserted by the crew into the MCDU.The light is on.
C. Dashes and the light is on =Managed speed such as V2 or memorized VAPP are automatically used by the FMGC.
A. The extract fan
B. The Pressure Reglating Valve
C. The siolation valves and the extraction fan
A. ± 6 degrees.
B. ± 74 degrees.
C. ± 95 degrees.
A. The pointer symbol and the ADF1 flag appear in RED.
B. The ground station characteristics pointer disappear and the RED ADF1 flag appears.
C. No ADF1 indications on ND.
A. To restore ECU power.
B. To restore EIU power.
C. To cut off ECU power.
