Which the two are true regarding a web application class loader？（）
AA web application may override the web container’s implementation classes
BA web application running in a J2EE product may override classes in the javax.* namespace
CA web application class loader may NOT override any classes in the java.* and javax.* namespace
DResources in the WAR class directory or in any of the JAR files within the library directory may be accessed using the J2SE semantics of getResource
EResources in the WAR class directory or in any of the JAR files within the library directory cannot be accessed using the J2SE semantics of getResource
（）、（）是计算机系统软件的两个重要特点。
具有3个结点的二叉树有（ ）。
A、2种形态
B、4种形态
C、7种形态
D、5种形态
What are two ways to create a rescue configuration on a J-series router?（）
AUse the J-Web System > Rescue menu.
BUse the J-Web Configuration > Rescue menu.
CIssue the configure rescue save command.
DIssue the request system configuration rescue save command.
（）网的出现，为Internet以及网络标准化建设打下了坚实的基础。
A、Ethernet
B、ARPAnet
C、NSFnet
D、Internet
What is the result？ （）
A、 The program prints “lava”.
B、 The program prints “java”.
C、 An error at line 7 causes compilation to fail.
D、 Complication succeeds but the program throws an exception.