题目内容

The pilots should have in mind some ______ plans in case the route cannot be flown for some reason like unexpected weather conditions.

A. refined
B. replaced
C. alternative
D. alternate

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At times the pilot may be required to ______ a flight plan for an alternate destination and to carry adequate fuel for this.

A. send
B. file
C. write
D. publish

The more work a pilot can do on the ground ______ departure, the easier it will be in the air.

A. prior to
B. after
C. when
D. for

Mode S is designed to help avoid over-interrogation of the transponder and to allow ______ collision avoidance.

A. mechanical
B. alternative
C. technical
D. automatic

It is important for pilots to select adequate________ before flight for pilotage navigation.

A. waypoints
B. checkpoints
C. references
D. alternate airports