【正确答案】There are four main types of delivery which produce packages: (1) lap (or roll), (2) can, (3) flyer lead, (4) bobbin lead. The first two types of delivery are used for twistless fiber assemblies; laps provide a means of feeding a continuous sheet of fibers from a compact roll, cans provide a large package for slivers. The other two methods provide packages for twisted rovings.