相关题目
（ ） change should be made by a radar controller to a clearance issued by a non-radar controller without the prior approval of the latter, except when special procedures are in effect, or when circumstances necessitate immediate action.
During VFR, two aircraft flying head-to-head at the same altitude should both turn to the right to avoid and have a minimum separation of （ ） m
The control position at tower, approach and area control office must have at least （ ） （ ）licensed controllers on duty.
To know exactly the arriving aircraft’s position, the control unit may ask the pilot to report （ ） .
The approach controller should start monitoring the aircraft （ ） minutes before it is expected to enter the controlled airspace, open the navaids, and obtain the landing procedure and runway-in-use for the aircraft from the tower controller.
Radar vectoring shall be achieved by （ ） the aircraft specific headings which will enable the aircraft to maintain the desired flight path.
Aircraft shall （ ） position reporting when advised that radar service is terminated or that radar identification is lost.
The airway width prescribed by PRC is （ ） km.
Wet lease of civil aircraft is approved by （ ） .
The turning altitude in an instrument approach procedure, the altitude when flying past FAF or outer marker, and the stairstep descent fix altitude are all the （ ） .
