cn 上海青岛深圳北京苏州成都 取代: ipc- 7525a – 年2月 ipc- 7525 – 年5月 if a conflict occurs between the english and. ipc- 7525b stencil design guidelines developed by the stencil design task group ( 5- 21e) of the assembly and joining processes committeeof ipc users of this p