An A/T Disengage flashing light (amber) indicates airspeed error under following conditions: inflight, flaps not up & airspeed differs from commanded value by _______ and is not approaching commanded value.
A.A. + or - 10 knots
B.B.+ 10 knots or - 5 knots
C.C.+ 5 knots or - 10 knots
D.D.+ 15 knots or -10 knots.
正确答案是B