2290
The microstructures of the samples were characterized by CT and scanning electron microcopy .
 material: microstructures; concept or principle: samples; enabling technology: CT; concept or principle: scanning
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: microstructures, samples, CT, scanning 
Answer:
 material: microstructures; concept or principle: samples; enabling technology: CT; concept or principle: scanning