See the description of marking important points such as the circle together, the scene, the hardness of material, p/o number, piece-work, work surfaces and check whether the material meets the lot crad?
The nature of the specimen marking key points, such as the round together, the scene, the hardness of the material, p / o number, part number, work surface and check material that meets the lot crad it.
Look of the target marking key points, such as the joint, the scene, the hardness of material P / number, O, target job number, skin. Check material and meet lot crad?