First, a 3000-ton ship is a fixed order of magnitude, and a 3000-ton ship is a tonnage range (see Article 3 for details). Second, different "ship types" have different tonnage ranges, which can be divided into general cargo ships, bulk carriers, oil tankers and container ships. 3. Take the general cargo ship as an example: 1 1,000 dwt (tonnage) includes 65,400 dwt. The range of 2000DWT is1501-2500; The range of 3000DWT is 2501-4500; The range of 5000DWT is 4501-7500; The range of 10000DWT is 7501-11500; The range of 15000DWT is11501-16500; The range of 20000DWT is16501-22000; The range of 30000DWT is 22001-35000; The range of 40000DWT is 3500 1-55000. For the tonnage range of other design ship types, please refer to the local edition of Code for General Layout Design of Seaports (design ship types).