3089
The forming qualities concerning surface topography , density , and internal defect of the EB-PBF-built samples prepared using two types of powders are characterized under the same processing conditions .
 forming, surface topography, density, defect, samples, powders
Please list all entity words in the text that fit the category. Output format is "word1, 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} 
Answer:
 forming, surface topography, density, defect, samples, powders