英文關鍵字
blue
business
chemical
construction
control
energy
engineering
environment
equipment
factory
fossil
fuel
gas
gasoline
gauge
heavy
industrial
industry
line
manufacturing
metal
natural
oil
petrochemical
petrol
petroleum
pipe
pipeline
piping
plant
power
pressure
processing
production
pump
red
refinery
silver
sky
station
steel
storage
structure
system
tank
technology
tower
tube
valve
white