2. Mechanical equipment refers to a (seat, car), a set or a group of devices with certain mechanical structure and driven by certain power to complete certain production and processing functions. Machinery and equipment refers to a device that is made of metal or other materials, assembled by several parts, driven by one or several kinds of power, and can complete functions or utilities such as production, processing and operation.
3. Materials are substances used by human beings to make articles, devices, parts, machines or other products.