There are several technicians working on various systems on a new workbench. Which of thefollowing should be reviewed to ensure all proper procedures are followed to help reduce anypossible issues?（）

A、MSDS

B、OEM

C、ESD

D、EMI

Which two statements are true about the rescue configuration file?（）

It must include a root password

It is roll back file number 50, and you can recover it by issuing rollback 50

It is created by issuing request system configuration rescue save

It is updated automatically when you commit

在下列网络的传输介质中，抗干扰能力最好的一个是（　　）。

A、光缆

B、同轴电缆

C、双绞线

D、电话线

You have been asked to use a 23-bit network mask to segment the network block 209.18.12.0, How many usable host address will there e per subnet?（）

A、510

B、1022

C、2046

D、8190

计算机操作系统的主要功能是（　　）。

A、对计算机的所有资源进行控制和管理，为用户使用计算机提供方便

B、对源程序进行翻译

C、对用户数据文件进行管理

D、对汇编语言程序进行翻译

A technician arrives in Germany and discovers that when their PC is plugged into the outlet, nopower is received. Which of the following actions should the technician take to get the PC tooperate?（）

A、Change the BIOS settings to the local time

B、Adjust the voltage selector switch

C、Attach a 220 volt power strip from the current region to the PC

D、Attach a 120 volt battery backup power supply to the PC