機器
abstract
africa
background
barrel
black
blur
business
chemical
concept
construction
electricity
energy
engineer
engineering
equipment
factory
fuel
gas
gasoline
heavy
industrial
industry
insulation
manufacturing
metal
modern
oil
petrochemical
pipe
pipeline
plant
plastic
plumbing
power
production
pump
refinery
sewage
south
stainless
steel
supply
tank
technical
technology
tube
valve
white
work