Hydraulic system pressure from System B will be used to retract the landing gear:
A.A.When System A pressure is low and the landing lever is positioned UP.
B.B.When the ALTERNATE NOSE WHEEL switch is positioned ON.
C.C.After failure of the No.1 engine with the landing gear still down and the landing gear lever is positioned up.
D.D.After a failure of the No.1 engine hydraulic pump with the landing gear still down and the landing gear lever is positioned UP.
正确答案是C