document.write('<br><span style="font-size:15px">上一篇</span> <a href=/shtmlnewsfiles/ecomnews/467/2012/2012110913404958612.shtml  target="_blank">简述我国制冷的发展史</a><br><span style="font-size:15px">下一篇</span> <a href=/shtmlnewsfiles/ecomnews/467/2012/2012120108505537342.shtml  target="_blank">空调的功能</a>')