词汇与结构Initially, the pilot needs to ______ headings to fly for each leg of the trip prior to departure.
A. estimate
B. assess
C. figure
D. calculate
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词汇与结构The ______ authorities will provide the forecast wind directions and speeds for pilots.
A. aeronautical
B. nautical
C. meteorological
D. physical
词汇与结构The ______ nature of the weather means that the pilot must be prepared to make further adjustments in flight.
A. predictable
B. unpredictable
C. prepared
D. unprepared
词汇与结构The primary instrument of navigation is the ______ compass.
A. magnetic
B. magic
C. material
D. magnificent
词汇与结构The pilot needs to take into account the slower initial ______during climb to calculate the time to top of climb.
A. ground speed
B. airspeed
C. adjusted speed
D. descent speed