4按运输方式分类 (1)直达提单 Direct b/) (2)联运提单( Through B) (3)多式联运提单 Combined Transport B/L) 5、特殊提单 1)倒签提单( Anti-dated Bl) (2)预借提单( Advanced bl)4按运输方式分类 （1）直达提单(Direct B/L) （2）联运提单(Through B/L) （3）多式联运提单(Combined Transport B/L) 5、特殊提单 （1）倒签提单（Anti-dated B/L) （2）预借提单(Advanced B/L)