_______ is a control area or portion thereof established in the form of a corridor, the centerline of which is defined by radio navigational aids.
A.Flying area
B.Airway
C.Lines
D.Radio line
正确答案是B
_______ is a control area or portion thereof established in the form of a corridor, the centerline of which is defined by radio navigational aids.
A.Flying area
B.Airway
C.Lines
D.Radio line
正确答案是B