Lesson 9 短对话选择-6
A. 3000feet
B. FL230
C. FL214
D. 7000feet
Lesson 9 短对话选择-7
A. follow D08, climb to 5700m
B. follow D08, climb to 5700m at 30
C. follow D08 request higher level from Control
D. follow D08 request FL330 on 128.3
Lesson 9 短对话选择-8
A. Heading
B. Flight Level
C. Position
D. Bearing
lesson 9 短对话选择-9
A. FL180 is not available
B. Conflicting traffic
C. ATC reason
D. Control problem
微信支付 
支付宝支付