%<PLAINTEXT>
\question
{Riichiro Saito}                  % Enter your name
{02/14/11}                        % Enter mm/dd/yy
{rsaito@flex.phys.tohoku.ac.jp}   % Enter e-mail address
{77-777}                          % Enter the number and question.
%question
{Here you can cut and paste the questions which can be downloaded from the web pages.}
%answer
{
The answer should be clear to all readers. The answer should not contain any special expression based on your languages. Especially check the following point before the submission. When we point out something in format, we will mention the following number. 
\begin{enumerate}
\item Do not use the word ``easy'' and ``clearly'' without explaining.
\item Do not use reference for explanation. The reference can be used only for the extention of the answer.
\item The answer is first and the reason is later. 
\item Use the equation environment for showing the proper number of equation. 
\item Use figures with figure captions. 
\item Labels (a), (b), (c) should be top of sentences.
\item Use minipage environment for setting the width of caption.   
\item Refere figures as Fig.\,\ref{fig:Q77-777-1} by using ``ref'' command.
\item Refere equations as Eq.\,(\ref{eq:Q77-777-1}) by using ``ref'' command.
\end{enumerate}
Hereafter you answer the question. 

% if you want to include figure. 
\begin{figure}[h]
\begin{center}
\includegraphics[width=6cm,clip]{Q1-1.eps}\\
\begin{minipage}{10cm}
\caption{(a) Explain an important points (b) explain in the text, too. (c) file should be eps file and the file name should be Q1-1-1.eps for Q1-1.}
\label{fig:Q77-777-1}
\end{minipage}
\end{center}
\end{figure}
%

For equations, use only equation environment. For fraction, use ``displaystyle'' environment. 
\begin{equation}
\begin{array}{l}
\displaystyle b_{i} = \frac{2\pi(a_{j}\times a_{k})}{a_{i} \cdot (a_{j}
 \times a_{k})} \\
\displaystyle b_{j} = \frac{2\pi(a_{k}\times a_{i})}{a_{j} \cdot (a_{k}
 \times a_{i})} \\
\displaystyle b_{k} = \frac{2\pi(a_{i}\times a_{j})}{a_{k} \cdot (a_{i}
 \times a_{j})} \\
\end{array}
\label{eq:Q77-777-1}
\end{equation}
If you found some errors in the existing answer, please send the both before and after the answers, too. Specify the errors.
} % Do not forget this.





