機器
abstract
background
barrel
building
business
chemical
chemistry
chimney
design
energy
engineer
engineering
environment
equipment
factory
fuel
gas
illustration
industrial
industrialplant
industry
insulation
line
manufacturing
metal
oil
oilindustry
pairs
petrochemical
petroleum
pipe
pipeline
piping
plant
pollution
power
production
pump
refinery
resources
stainless
steel
supply
technology
tower
tube
valve
welding
worker
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