General items: general equipment manufacturing (excluding special equipment manufacturing); mechanical and electrical equipment manufacturing; intelligent instrumentation manufacturing; intelligent basic manufacturing equipment manufacturing; industrial control computer and system manufacturing; power transmission, distribution and control equipment manufacturing; Internet of Things equipment manufacturing; sales of mechanical and electrical equipment; sales of intelligent instruments and meters; sales of intelligent basic manufacturing equipment; sales of industrial control computers and systems; sales of Internet of Things equipment; sales of network equipment; sales of Internet equipment; electronic products