When executing a flight, the flight crew should check in _______ before ETD and make well pre-flight preparations.
A.40 minutes
B.1 hour
C.1.5 hours
D.2 hours
正确答案是B
When executing a flight, the flight crew should check in _______ before ETD and make well pre-flight preparations.
A.40 minutes
B.1 hour
C.1.5 hours
D.2 hours
正确答案是B