First of all, a certain knowledge on metal's heat treatment is required.
2
对加工工艺有丰富的知识，如机加工，锻造，注塑，热处理和表面处理等工艺。
Good knowledge about manufacturing process, such as machining, forging, injection molding, heat treatment and surface treatment, etc.
3
本课题为改善棉花打杆铲的使用性能，提高其使用寿命，利用热处理技术和断口学的知识而作的试验研究。
This subject aims to improve cotton hits the pole shovel using, enhances its service life, does the experimental study using the heat treatment technology and the fracture study knowledge.
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