機器
art
business
cartoon
chemical
colorful
crane
crude
design
diesel
drill
drilling
earth
ecology
energy
environment
equipment
flat design
fossil
fuel
gas
gasoline
graphic
icon
illustration
industrial
industry
jack
object
oil
petrol
petroleum
pipe
planet
platform
power
production
pump
refinery
resource
sign
silhouette
simple
supply
symbol
technology
tower
well
work
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