Answer:
laser
Explanation:
These are well known printer types now. Let's review how they work to determine in which does heat plays a role.
inkjet: inkjet printers are printer throwing ink at the paper in the form of little drops. No heat involved here.
impact: That's the oldest technology, where a printing head is moving left and right to punch a printing ribbon and transfer ink onto the paper. No heat involved.
3D: 3D printers don't usually use paper... as they use other materials to create a 3D representation of a model. Heat is involved in the melting of the material before it's placed on the building model. But no paper involved here.
laser: laser printers are working very much like a photocopier machine... memorizing the pattern to be printed, then transferring it onto paper... using heat.
Civil engineers is the correct business
