A9611A S26设备的RUN(运行指示灯)显示绿色,慢闪:0.3S亮,0.3S灭,表示()。
A.硬件故障
B.单板运行正常
C.版本加载中
D.无电源输入
A.硬件故障
B.单板运行正常
C.版本加载中
D.无电源输入
如果要运行SMENU.MPR文件,正确的命令是()。
A)DO MENU SMENU
B)DO SMENU.MPR
C)RUN MENU SMENU
D)RUN SMENU.MPR
对下列程序的叙述中,正确的是
1:public class X extends Thread implements Runnable{
2:publ主c void run(){
3: System.out.println(“this is run()”);
4:}
5:public static void main(String args〔〕){
6:Threadt二new Thread(new X());
7:t.start();
8:}
9:}
A.第1行会产生编译错误
B.第6行会产生编译错误
C.第6行会产生运行错误
D.程序正常运行
阅读以下说明,回答问题1至问题8。
[说明]
Linux 系统开机引导时首先启动内核,由内核检查和初始化硬件设备,载入设备的驱动程序模块,安装root文件系统,然后内核将启动一个名为init的进程。在init运行完成并启动其他必要的后续进程后,系统开始运行,引导过程结束。init进程启动时需要读取inittab配置文件,该文件确定init在系统启动和关机时的工作特性。典型的inittab文件内容见以下清单:
inittab This file describes how the INIT process should set up
the system in a certain nm-level.
Default nmlevel. The nmlevels used by RHS are:
0 - halt (Do NOT set initdefault to this )
1 - Single user mode
2-Multiuser, without NFS (The same as 3, if you do not have networking)
3 - Full multiuser mode
4 - unused
5-Xll
6 - reboot (Do NOT set initdefault to this )
id:5:initdefault:
System initialization.
si::sysinit:/etc/rc.d/rc.sysinit
10:0:wait:/etc/rc.d/rc 0
11:1:wait:/ete/rc.d/rc 1
12:2:wait:/etc/rc.d/rc 2
13:3:wait:/etc/rc,d/rc 3
14:4:wait:/etc/rc.d/rc 4
15:5:wait:/etc/rc.d/rc 5
16:6:wait:/etc/rc.d/rc 6
Trap CTRL-ALT-DELETE
ea::ctrlaltdel:/sbin/shutdown -t3 -r now
When our UPS tells us power has failed, assume we have a few minutes
of power left. Schedule a shutdown for 2 minutes from now.
This does, of course, assume you have powerd installed and your
UPS connected and working correctly.
pf::power fail:/sbin/shutdown -f-h +2 "Power Failure: System Shutting Down"
If power was restored before the shutdown kicked in, cancel it.
pr: 12345:powerokwait:/sbin/shutdown-c "Power Restored; Shutdown Cancelled"
Run gettys in standard rtmlevels
1:2345 :respawn:/sbin/mingetty tty1
2:2345:respawn:/sbin/mingetty try2
3:2345 :respawn:/sbin/mingetty try3
4:2345:respawn:/sbin/mingetty tty4
5:2345:respawn:/sbin/mingetty tty5
6:2345 :respawn:/sbin/mingetty tty6
Run xdm in runlevel 5
x:5:respawn:/etc/X 11/prefdm -nodaemon
启动init进程前,不需要经过______步骤。
A.LIIO加载内核 B.检测内存
C.加载文件系统 D.启动网络支持