機器
background
boiler
conduction
connection
construction
convection
design
diffusion
energy
engineering
equipment
exchanger
factory
fuel
furnace
heat
heater
heavy
heritage
historic
historical
industrial
industry
iron
mechanical
metal
metallic
objects
old
pipe
pipeline
pipes
plans
pressure
process
radiation
revolution
steam
steel
system
technology
temperature
texture
textured
thermal
thermodynamics
tube
vintage
wall