Secondly, for the bidding, we explain the Procurement bidding procedures and several methods: single-source procurement, inquiry procurement, selective bidding, two-stage bidding, negotiation procurement, seeking advice procurement and competitive bidding purchasing. 其次,针对招标采购,阐述招标采购的程序以及招标采购的几种方法:单一来源采购、询价采购、选择性招标采购、两阶段招标采购、谈判采购、征求意见采购及竞争招标采购。