【单选题】What is use of Network Layer?
A.
To establish connection
C.
Network layer performs routing.
【简答题】If the ozone layer is destroyed by car, what will happen?
【简答题】第三章、北京冬奥会设____个大项,____个分项,____个小项。
【单选题】What architectural layer does a servlet belong to?
A.
The Presentation layer
【单选题】北京冬奥会共设几个大项?多少个分项?多少个小项?
【简答题】北京冬奥会设 个大项, 个分项, 个小项。