機器
business
chemical
coalmine
control
cooling
electric
electrical
electricity
energy
engine
engineering
equipment
factory
fuel
gas
heat
historic
industrial
industry
line
liquid
machinery
manufacturing
metal
mining
motors
oil
old
pipe
pipeline
piping
plant
power
pressure
production
pump
pumps
station
steel
supply
system
technology
treatment
tube
turbine
valve
water
work