str="" str=str + "" str=str+ "
" str=str+"
 高级班问答" str=str+"
 音节码" str=str+"
 软件操作" str=str+"
 硬件问答" str=str+"
 看屏" str=str+"
 生文章的练习" str=str+"" str=str + "
" document.write (str)