機器
back
barrel
bird
black
business
commercial
construction
crane
currency
derrick
drill
drilling
energy
engine
environment
environmental
equipment
exploration
fuel
gas
gasoline
generation
helicopter
industry
large
light
natural
occupation
ocean
oil
petrol
pipe
pipeline
plant
platform
pollution
power
pump
resource
rig
shadow
silhouette
supply
technology
tower
water
working