Labs Laboratories are an important part of ME250.The labs will provide hands-on experience in the use of CAD systems, computer numerically controlled (CNC) machines and other aspects of manufacturing. Shanghai Jiao Tong University 7Shanghai Jiao Tong University 7 Labs n Laboratories are an important part of ME250. The labs will provide hands-on experience in the use of CAD systems, computer numerically controlled (CNC) machines and other aspects of manufacturing