機器
area
barrel
beam
bright
color
column
crisis
crude
discharge
eccentric
ecology
economic
emulsion
energy
environment
field
forest
fuel
gas
head
hydrocarbons
industry
landscape
mechanism
minerals
mining
natural
oil
oilfield
oilman
oilrich
petroleum
piston
prices
production
products
pumping
pumpjack
resources
rocking
rotating
shale
snowy
unit
walking
well
wheel
winter