是不是要以前单位的抬头纸，加上同事的签名，名片就行了。<br />
ACS会电话回访什么的么？<br />
<br />
To whom it may concern,<br />
<br />
I was the supervisor of Boyi Zhang when he worked for XXXX company. He performed as an outstanding System and Network Administrator and I would really highly praise him.<br />
<br />
During his 6 years (From July 2005 to Sept 2011) with me, he did good jobs in the following fields:<br />
<br />
1, Maintained a Nation-wide Microsoft Active Directory and Microsoft Exchange Mail System, which has 45 sites around China;<br />
2, Managed the core node in Beijing, EMC and IBM SAN Storage System, IBM Tape Library, Brocade Fabric Switch and more than 50 PC Servers;<br />
3, Managed Microsoft SQL server Databases, VMware ESX virtual servers, Monitoring tools, Anti-Virus tools and so on;<br />
4, Coordinated with the leaders and workmates to make working plans, be responsible for the daily operation ,make system upgrade programs.<br />
<br />
In all, I think he could act perfectly as a System and Network Administrator.<br />
<br />
Yours Sincerely