ThinkPad X250系统恢复到出场设置

随机的系统是Win10的64位专业版降级到Win7的64位专业版；

然后由于在使用过程中系统提醒升级到Win10的64位专业版，导致Lenovo的F
11的一键恢复功能无法使用，无法使用Lenovo的硬盘分区进行系统恢复。

使用F11的一键恢复功能的方法：首先重启系统（注意必须要重启，关机之后再开机不行），然后按住回车键，然后显示快捷键的菜单，其中包括F11键，进入Lenovo的系统恢复界面。

但是，当升级Win10专业版后，这个功能已经失去，需要使用Win10自带的回复出场设置的功能。Setting--Update & security--Recovery

Windows 系统和 Mac 下的远程桌面连接

1.Mac 下远程桌面连接 Windows 系统:

推荐微软的RDC, 下载地址：http://www.microsoft.com/mac/remote-desktop-client。

另一个是CoRD,下载地址：http://cord.sourceforge.net/

2.Windows 系统远程桌面连接 Mac （使用vnc）:

在 Mac 下安装 VNC server, 推荐VineServer, 下载地址：http://sourceforge.net/projects/osxvnc/

Windows 下可以使用 TightVNC, RealVNC（收费的） 和 UltraVNC.

How can I add more than one logo to my beamer presentation?

Beamer provides \logo{} to set the logo(s). You could just add all three logos in there using three \includegraphics command (or PGF image commands). Where they are placed depends on your chosen scheme. If you want them a little larger on the title page you can insert the defined logo(s) manually \insertlogo e.g. inside a \scalebox.

The following code adds three scaled logos with one space as a separator into the right border. The default (blank) scheme puts them into the lower right corner.

\documentclass{beamer}

\author{Me}
\title{Presentation}
\logo{%
    \includegraphics[width=1cm,height=1cm,keepaspectratio]{logo1}~%
    \includegraphics[width=1cm,height=1cm,keepaspectratio]{logo2}~%
    \includegraphics[width=1cm,height=1cm,keepaspectratio]{logo3}%
}
\institute{Three Kings\\\scalebox{2}{\insertlogo}}
\begin{document}
\frame{\maketitle}
\frame{text}
\frame{}

\end{document}

you can have several logos on the page. The question is only where they should appear. Here an example for the second one in the sidebar.

\documentclass{beamer}
\usecolortheme{dove}
\useoutertheme{sidebar}
\pgfdeclareimage[height=2.25ex,width=2.5\baselineskip]{institut-logo}{zedat}
\pgfdeclareimage[height=1.3cm]{uni}{fu-berlin}
\logo{\pgfuseimage{uni}}
\setbeamertemplate{footline}{\raisebox{-2ex}{\pgfuseimage{institut-logo}}
  \usebeamerfont{date in head/foot}\insertshortdate{}\hfill
  \usebeamertemplate{navigation symbols}\hfill
  \insertframenumber{}/\inserttotalframenumber}
\setbeamertemplate{sidebar right}{}

\begin{document}
\begin{frame}{Das Logo}
\begin{block}{Ein Beispiel mit der Umgebung \texttt{block}}
Es ist offensichtlich, dass wir hier zwei Logos auf der Folie haben.
\end{block}
\end{frame}
\end{document}

from: http://tex.stackexchange.com/questions/18410/how-can-i-add-more-than-one-logo-to-my-beamer-presentation