The development history of multimedia teaching equipment：A complete multimedia computer system is composed of hardware and software. Its core is a computer, and its peripherals are......

Multimedia computer-assisted teaching equipment refers to the use of multimedia computers to comprehensively process and control symbols, language, text, sound, graphics, images, images and other media......

Junior high school physics electromagnetics teaching instrument hand-cranked three-phase AC and DC generator.1. Purpose: Demonstrate the generation of three-phase AC and DC generators and the connection of three-phase circuits......