機器
aperture
background
barrel
blue
bolt
casings
chink
choke valve
closing
construction
damper
drilling
electricity
energy
energy dependence
equipment
fence
fuel
gas
industry
latch
management
manufacture
nature
oil
pipe
pipeline
power
pressure
pump
pylon
rig
screw
steel
technology
tower
tree
tube
valve
wellhead
wheel
yellow