機器
abstract
background
black
blue
business
chemical
concept
construction
design
energy
engineer
engineering
environment
equipment
factory
fuel
gas
gasoline
heavy
industrial
industrialplant
industry
insulation
light
line
manufacturing
metal
night
oil
oilindustry
pipe
pipeline
pipelines
pipes
piping
plant
power
production
refinery
stainless
steel
supply
technology
tower
tube