【单选题】Certification of airworthiness is initially conferred by a certificate of airworthiness from a national aviation authority, and is maintained by performing the required maintenance actions. airworthin...
A.
Airworthiness is the measure of an aircraft's suitability for safe flight
B.
a special aircraft used for taking people to hospital
C.
a place where planes take off and land, with buildings for passengers to wait in
D.
a place where planes can fly from, especially one used by military planes
【简答题】Write down the words according to the definitions. _________________: move or change from one vehicle to another in the course of a journey ________________: a raised flat suce built along the side...