Package clash in multilingual report

Question

I m workig on multilingual report. Below code is part of my code (Pls consider it as MWE). In the code below there is package clash error

! LaTeX Error: Option clash for package inputenc.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              

l.33 \usepackage
                [russian]{babel}

Also chinese font cannot be printed. How can i avoid it?

\documentclass[11pt,table,a4paper]{article}
\usepackage{array,ragged2e}
\usepackage{graphicx}
\usepackage[framemethod=TikZ]{mdframed}
\usepackage{lipsum}
\usepackage[top=.5cm, bottom=2cm, left=1cm, right=1cm]{geometry}
\usepackage{wrapfig}
\usepackage{comment}
\usepackage{parskip}
\usepackage{framed}
\usepackage{sidecap}
\usepackage{setspace}
\usepackage[scaled]{uarial}
\usepackage{tikz}
\usepackage{lipsum} 
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage[utf8]{inputenc}
\usepackage{fancyhdr}
\usepackage{transparent}
\usepackage{lmodern}
\usepackage[T1]{fontenc}
\usepackage{hyphenat}
\usepackage{xstring}
\usepackage{forloop}
\usepackage{collcell}
\usepackage{longtable}
\usepackage{makecell}
\usepackage{varwidth}
\usepackage{CJKutf8}
\usepackage[T2A]{fontenc}
%\usepackage[koi8-r]{inputenc}
%\usepackage[russian]{babel}

\begin{document}
  Это мой первый многоязычный докладе.
\newline
This is my first multilingual report.
\newline
这是我的第一个多语种的报告。
\end{document}

I m in great need. Pls help me out.

Answer 1

\documentclass[11pt,table,a4paper]{article}
\usepackage[T1,T2A]{fontenc}
\usepackage{lmodern}
\usepackage[koi8-r,utf8]{inputenc}
\usepackage{CJKutf8}
\usepackage[russian]{babel}

\newenvironment{SChinese}{%
  \CJKfamily{gbsn}%
  \CJKtilde
  \CJKnospace}{}

\begin{document}

  Это мой первый многоязычный докладе.

This is my first multilingual report.

\begin{CJK}{UTF8}{}
\begin{SChinese}
这是我的第一个多语种的报告。

\end{SChinese}
\end{CJK}
\end{document}

and the same with xelatex (Code2000.ttf) is free availble in the net

\documentclass{article}
\usepackage{fontspec}
\setmainfont{Code2000}
\begin{document}

  Это мой первый многоязычный докладе.

This is my first multilingual report.    

这是我的第一个多语种的报告。

\end{document}

Answer 2

Your example includes several packages twice. Usually that is not a good idea and will cause problems. Anyway, to address your specific question, you need to use the mechanisms of the CJK package; your system should include a useful example file CJKutf8.tex under the CJK documentation directory. Additionally, you ought to tell latex which language different sections of the document are in, otherwise hyphenation will be inappropriate. Here is a minimal example with your three languages:

\documentclass[11pt,table,a4paper]{article}

\usepackage{lmodern}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}

\usepackage{CJKutf8}
\usepackage[english,russian]{babel}

\newenvironment{SChinese}{%
  \CJKfamily{gbsn}%
  \CJKtilde
  \CJKnospace}{}

\begin{document}
\selectlanguage{russian}
  Это мой первый многоязычный докладе.

\selectlanguage{english}
This is my first multilingual report.

\begin{CJK}{UTF8}{}
  \begin{SChinese}
    这是我的第一个多语种的报告。
  \end{SChinese}
\end{CJK}

\end{document}