機器
alternative
atom
banner
building
business
chemical
cog wheel
collection
construction
derrick
droplet
ecology
economic
electricity
energy
engineering
equipment
europe
factory
fuel
gas
gear
germany
icon
illustration
industrial
industry
innovation
internet
manufacture
manufacturing
nuclear
oil
petrol
plant
pollution
power
recycling
refinery
set
silhouette
supply
symbol
technology
web
wind