69、硝铵炸药常用( )为防潮剂。

16、Passengers to San Francisco by Flight CA 783, please go through( ).

15、——What will happen to me if I refuse the security check?
——( ).

14、Sorry sir,you have to( ) this baggage,for it is too large and will cause you a lot of inconvenience.

13、Passengers,if you haven’t got a boarding card and a baggage check,please go to the( ) to go through the check-in procedures first.

12、A: Are you going to take a domestic or an international flight?

68、A: What’s the( ) of the delay?

31、X射线机灰度分辨力用英文表示为( )。

20、All cargo intended for carriage on passenger or cargo flight shall ( )or go through other security measures before loading.

19、Please form a queue and pass the gate( ).

18、An air ticket is only( )for the passenger whose name appears on the ticket.