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

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