It is recommended to update the mobile phone system, or download the latest version of the app to match the mobile phone system.

Hardware Manual is a book published by Machinery Industry Press on June 20 10. The manual covers ferrous metals, nonferrous metals, nonmetals and other hardware materials commonly used in industrial and agricultural research, production and use, fasteners, transmission parts, various equipment and accessories, various hand tools, pneumatic tools, electric tools and various commonly used test instruments.