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发帖数: 334 | 1 \documentclass[clock]{slides}
%\usepackage{float}
\usepackage[dvips]{color, graphicx}
\usepackage{pstricks,pst-node,pst-coil,pst-grad}
\begin{document}
\begin{slide}
\textbf{Vibrations of the Linear Symmetric Triatomic Molecule}
\begin{itemize}
\item Symmetric Stretch
\begin{pspicture}(-.5, -.5)%(1, 1)
\cnode[fillstyle=solid,fillcolor=gray](-2.7,-1.5){.3}{A}
\cnode[fillstyle=solid,fillcolor=gray](.0,-1.5){.3}{B}
\cnode[fillstyle=solid,fillcolor=gray](2.7,-1.5){.3}{C}
\nccoil[ |
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