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Using X-ray micro computed tomography , it was demonstrated that the porosity of the PA12 and composite parts were less than 1 % .
 process characterization: X-ray micro computed tomography; machanical property: porosity; material: PA12; material: composite
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: X-ray micro computed tomography, porosity, PA12, composite 
Answer:
 process characterization: X-ray micro computed tomography; machanical property: porosity; material: PA12; material: composite