3854
Meanwhile , additive manufacturing is increasingly being used for heat exchangers and heat removal devices , which demand high thermal conductivities .
 manufacturing process: additive manufacturing; machine or equipment: heat exchangers; concept or principle: heat; machanical property: thermal conductivities
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: additive manufacturing, heat exchangers, heat, thermal conductivities 
Answer:
 manufacturing process: additive manufacturing; machine or equipment: heat exchangers; concept or principle: heat; machanical property: thermal conductivities