8498
Moreover , several scenarios with different blending acceleration factors are simulated , for the cases of a constant extrusion rate and an extrusion rate proportional to the printing head speed .
 manufacturing process: blending; process parameter: extrusion rate; process parameter: extrusion rate; machine or equipment: printing head
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: blending, extrusion rate, extrusion rate, printing head 
Answer:
 manufacturing process: blending; process parameter: extrusion rate; process parameter: extrusion rate; machine or equipment: printing head