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