4ҳ 2.5.1?ѽ??еĵ????о???Ŀ????ɹ? ........................................................................ 12 2.5.2???????ƹ?????? ................................................................................................ 12 2.5.3??ַ?????ͳ?????????????? ............................................................................ 13 2.5.4ֱ??ɸ??Ŀ??????ı??ơ?????????????? .................................................... 13 2.6???????? ........................................................... 13 ???? ??ҵ?г????? ...................................... 15 3.1?г????? ........................................................... 15 3.1.1?⽨??Ŀ????????;???? .................................................................................... 15 3.1.2??Ʒ???????????????? ........................................................................................ 15 3.1.3??Ʒ???????????????? ........................................................................................ 16 3.1.4?????Ʒ???? ........................................................................................................ 16 3.1.5??Ʒ?۸???? ........................................................................................................ 16 3.1.6?????г????? ........................................................................................................ 17 3.2?г?Ԥ?? ........................................................... 17 3.2.1?????г?????Ԥ?? ................................................................................................ 17 3.2.2??Ʒ???ڻ??????????? .................................................................................... 18 3.2.3?۸?Ԥ?? .....................
