機器
background
barrel
building
chemical
chemistry
chimney
concrete
construction
energy
engineer
engineering
environment
environmental
equipment
factory
fuel
gas
global
heavy
industrial
industrialplant
industry
insulation
manufacturing
metal
oil
oilindustry
pairs
petrochemical
petroleum
pipe
pipeline
piping
plant
pollution
power
pressure
production
pump
resources
stainless
steel
structure
supply
technology
tower
tube
valve