(21) Create and sustain selection processes to ensure the most responsive and dependable sources for furnishing necessary high quality areas and components and to advertise competitive sourcing amid trusted suppliers so that purchases are affordable and from resources that satisfy contractor excellent prerequisites, such as the requirements of 252. 对于有移位操作的非法指令，C为移位操... https://contractorpurchasingsyste71367.blogsvirals.com/32889796/contractor-purchasing-system-review-an-overview