機器
area
background
barrel
business
chemical
chemistry
chimney
close
complex
concept
construction
ecology
electricity
energy
engineer
engineering
environment
environmental
factory
fuel
gas
heavy
industrial
industry
line
manufacture
metal
oil
petrochemical
petrol
petroleum
pipe
plant
pollution
power
production
pump
refinery
resources
station
steam
structure
supply
technology
tower
tube
up
valve
zone