機器
abstract
background
barrel
black
blue
business
chemistry
concrete
energy
engineer
engineering
equipment
estate
ethylene
factory
fuel
gas
heavy
illustration
industrial
industrialplant
industry
insulation
line
manufacturing
metal
oilindustry
pairs
pipe
pipeline
piping
plant
pressure
production
pump
refinery
resources
shine
sign
stainless
steel
supply
technology
tube
valve
worker
workshop