is an aircraft that has not yet been fully proven in flight. Often, this implies that new aerospace technologies are being tested on the aircraft.
举一反三
- All the flight instruments operate on air taken from outside of the aircraft during flight.
- The aircraft must be placed in a flow _________ the aircraft’s route of flight.
- The aircraft must be adjustedin a flow consistent with the aircraft's route of flight.
- In flight, an aircraft makes a turn from level flight at slow speed, the pilot will feel that the aircraft（ ）
- The pilot in command of an aircraft is the person _______ the aircraft who is responsible for its operation and safety during flight.