http://www.google.com/patents?id=d_jTAAAAEBAJ&printsec=abstract&zoom=4&source=gbs_overview_r&cad=0#v=onepage&q&f=false
不过是回答问题 这个也是
http://www.google.com/patents?id=adfIAAAAEBAJ&printsec=abstract&zoom=4&source=gbs_overview_r&cad=0#v=onepage&q&f=false
页:
[1]