英文關鍵字
blue
business
catalytic
chemical
column
combustible
copyspace
economy
engineer
engineering
environment
environmental
equipment
factory
fuel
gas
industrial
industry
main
manufacture
manufacturing
metal
oil
petrochemical
petroleum
pipeline
plant
pollution
power
preliminary
produce
production
products
raw
rectification
rectified
refinery
refining
resource
shop
sky
smell
station
steam
technology
tower
working
workshop