After receiving takeoff clearance, pilot must takeoff within _______ minutes or he will ask for a new clearance/.
A.1
B.2
C.3
D.4
正确答案是A
After receiving takeoff clearance, pilot must takeoff within _______ minutes or he will ask for a new clearance/.
A.1
B.2
C.3
D.4
正确答案是A