因此，各大型零部件的选材、无损检测、结构设计、加工与热处理直到组装试验，每一步都要很严格。
Therefore, the large parts of the material, nondestructive detection, structure design, machining and heat treatment until the assembly test, every step is very strict.
针对本厂生产的柴油机中合金铸铁和低合金钢表面热处理的大型零部件进行对比测试，扩大里氏硬度计在实践中的应用。
In this paper, large alloy iron parts and low-alloy steel parts after surface heat treatment, used in the diesel engine, were tested and compared. By Leeb hardness sclerometer.
不过，由于供应链在经济衰退期间受到了削弱，大型制造商在获得重要零部件方面可能遇到困难，从而无法及时扩大生产以满足需求。
However, big manufacturers could be held back by their inability to secure vital components from supply chains weakened by the downturn and unable to increase production fast enough to meet demand.
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