The research of heating in selective laser sintering (SLS) of powders mostly focuses on the sintering process, but the research of the preheating process is not sufficient.
对选择性激光烧结(SLS)加热的研究多数集中在烧结过程上，而对预热过程的研究还很不完善。
Preheating process is very important because it affects machining quality directly.
预热效果直接对加工质量产生很大的影响。
Preheating process is very important because it affects machining quality directly.
预热效果直接对加工质量产生很大的影响。
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