We traveled to Chongqing last year in the 11th team-building game. This year, due to the epidemic, we chose to be in a playground to exercise and relax ourselves.
In production, heat treatment is often divided into two types: preliminary heat treatment and final heat treatment. In order to eliminate some defects of the blank or semi-finished product...
Some metalworking processes were developed as early as 4000 B. C.. However, it was not until the beginning of the Industrial Revolution in the 1750s...