3489
Precursor and pre-alloyed powders are preheated and selectively melted using a range of EBM process parameters including beam scan strategies , beam current variations , and cooling rate features .
 material: Precursor; material: powders; concept or principle: melted; process parameter: range; manufacturing process: EBM; concept or principle: parameters; machine or equipment: beam; machine or equipment: beam; concept or principle: variations; process parameter: cooling rate
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: Precursor, powders, melted, range, EBM, parameters, beam, beam, variations, cooling rate 
Answer:
 material: Precursor; material: powders; concept or principle: melted; process parameter: range; manufacturing process: EBM; concept or principle: parameters; machine or equipment: beam; machine or equipment: beam; concept or principle: variations; process parameter: cooling rate