ΪƽҵùѡѧԺҵ⣬˹ѧԺҵʦչϷظרʵʱԽӵķʽҵѧԺıݹͨһؿѧҵҵ
ǶԽӵļҵ
1. ʡĻý˾
2. һĻ˴O
3.ʡ·زͣţ˾
4.ʡǹʤƼ˾
˴λЧԽҵְߣΪҵƸɱùȱڣҲΪѧԺؿҵʵƶȾҵգʵ˫ӮһϷظڽ̬չŻҵ