| 2. | Ferrous metals , non - ferrous metals , ic thin sections , coatings , ply - metals ; glass , ceramics , agate , precious stones ; hardness testing such as that on the depth and the trapezium of the carbonized layers and quench hardened layers
黑色金属、有色金属、 ic薄片、层压金属、表面涂层；玻璃、陶瓷、玛瑙、宝石等；炭化层和淬火硬化层的深度及梯度的硬度测试。 |
