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The results show that based on the proposed systematic hierarchical approach , optimal process parameters can be efficiently established for high-quality SLM parts from metal powders .
 process parameter: optimal process; material: be; manufacturing process: SLM; material: metal powders
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
 Entities: optimal process, be, SLM, metal powders 
Answer:
 process parameter: optimal process; material: be; manufacturing process: SLM; material: metal powders