機器
background
barrel
blue
bolt
business
chink
closeup
closing
clouds
construction
crane
damper
drill
drilling
ecology
energy
environment
equipment
extraction
field
fuel
gas
industrial
jack
latch
nature
oil
outdoor
overlapping
petroleum
pipe
pipeline
platform
pollution
power
production
pump
raw
rig
rocking
screw
sky
torch
trees
valve
well
wheel
work