目前WLAN支持的最安全的数据报文保护机制是().
设直放站上行噪声电平为P,从施主基站(CDU端)到直放站输入端的信号损耗为80dB,则要求直放站上行噪声电平()。
Which command is used to restore a Junos device to its default state?()
A、load factory-default
B、load override factory-default
C、load replace default
D、load set default
public class Threads4 { public static void main (String[] args) { new Threads4().go(); } public void go() { Runnable r = new Runnable() { public void run() { System.out.print(”foo”); } }; Thread t = new Thread(r); t.start(); t.start(); } } What is the result?()
A、 Compilation fails.
B、 An exception is thrown at runtime.
C、 The code executes normally and prints „foo”.
D、 The code executes normally, but nothing is printed.
When comparing java.io.BufferedWriter to java.io.FileWriter, which capability exists as a method in only one of the two?()
A、 closing the stream
B、 flushing the stream
C、 writing to the stream
D、 marking a location in the stream
E、 writing a line separator to the stream
运行下列程序, 会产生什么结果()。
A、第一行会产生编译错误
B、第六行会产生编译错误
C、第六行会产生运行错误
D、程序会运行和启动