69、梯恩梯外观为( )结晶体,受阳光照射后,颜色变暗,撞击感度也提高。

14、( ) is the place where airplanes take off or land.

13、Please go to the airline counter to( ).

31、X射线机单次检查吸收剂量用英文表示为( )。

17、( )means “A large packing case or box that clasps shut, used as luggage or for storage”.

16、Please put all your( )on the plate.

15、——What should I do first before boarding?
——( )

14、Which of the following is not included in a passenger’s travel documents?

13、Please go to the( ) to check in for your flight.

31、X射线机泄漏射线量率用英文表示为( )。

16、An air carrier shall prevent( )access to cargo accepted for transportation on an aircraft.