Introducing a good teacher and friend - "Mechanical Workers"

Dear workers, leaders, comrades: We all encounter technical or quality problems in production or work. For example, for our heat treatment workers, how to ensure the quality of quenching? For our turners, milling workers, how to process difficult to process titanium alloy, stainless steel? ... These problems are many, for engineers, senior engineers There are also some technical problems that need to be learned and need to be consulted. When I