機器
3d
3d rendering
alternative
atom
building
business
chemical
cog wheel
collection
construction
derrick
droplet
ecology
economic
electricity
energy
engineering
equipment
european union
factory
flag
fuel
gas
gear
icon
illustration
industrial
industry
internet
manufacture
manufacturing
nuclear
oil
petrol
plant
pollution
power
pump
recycling
refinery
rendering
set
silhouette
supply
symbol
technology
wind
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