機器
appliance
automation
background
boiler
building
central
city
construction
control
copper
electric
electricity
energy
engineering
equipment
factory
faucet
gas
heat
hot
improvement
industrial
industry
maintenance
manometer
metal
modern
pipe
pipeline
plastic
power
pressure
pump
renovation
service
sky
steam
steel
street
system
technical
technology
tube
utility
valve
water
wires