为了实现类型不同的子网互联,OSI参考模型把网络划分成多格子网,以下那几个属于这几个子层?
在Java语言中,不能注释多行内容的符号是()。
A、以//开始的注释
B、以/*开始,*/结束的注释
C、以/**开始,*/结束的注释
D、以上都不能
Your database instance is running with full workload after database creation. You have decided to use a fixed-size undo tablespace. You want to use the Undo Advisor to estimate the capacity of the undo tablespace. Which two factors must you consider before using the Undo Advisor to estimate the capacity of the undotablespace()
AThe retention period to support flashback
BThe expected length of the longest-running query
CThe number of undo tablespaces in the database
DThe size of the Flash Recovery Area for the database instance
实例初始化块是在该类的构造方法之后执行的。
A、对
B、错
两端用户传输文件,应属于下列OSI的哪一层处理?()
A、表示层
B、会话层
C、传输层
D、应用层
public class X implements Runnable ( private int x; private int y; public static void main(String args) ( X that = new X(); (new Thread(that)) . start( ); (new Thread(that)) . start( ); ) public synchronized void run( ) ( for (;;) ( x++; y++; System.out.printIn(“x = “ + x + “, y = “ + y); ) ) ) What is the result?()
A、 An error at line 11 causes compilation to fail.
B、 Errors at lines 7 and 8 cause compilation to fail.
C、 The program prints pairs of values for x and y that might not always be the same on the same line (for example, “x=2, y=1”)
D、 The program prints pairs of values for x and y that are always the same on the same line (forexample, “x=1, y=1”. In addition, each value appears twice (for example, “x=1, y=1” followed by “x=1, y=1”)
E、 The program prints pairs of values for x and y that are always the same on the same line (for example, “x=1, y=1”. In addition, each value appears twice (for example, “x=1, y=1” followed by “x=2s, y=2”)